diff --git a/api/app/FormBuilder/Bindings/FormBindingApplicator.php b/api/app/FormBuilder/Bindings/FormBindingApplicator.php
index 8501cd10..ddeafd6d 100644
--- a/api/app/FormBuilder/Bindings/FormBindingApplicator.php
+++ b/api/app/FormBuilder/Bindings/FormBindingApplicator.php
@@ -7,6 +7,7 @@ namespace App\FormBuilder\Bindings;
 use App\Enums\FormBuilder\BindingTargetType;
 use App\Enums\FormBuilder\FormFieldBindingMergeStrategy;
 use App\Exceptions\FormBuilder\FormBindingApplicatorException;
+use App\Exceptions\FormBuilder\FormBindingApplicatorTimeoutException;
 use App\Exceptions\FormBuilder\FormBindingInfraException;
 use App\Exceptions\FormBuilder\FormBindingSchemaConfigException;
 use App\FormBuilder\Purposes\PurposeRegistry;
@@ -28,6 +29,10 @@ use Throwable;
  *   - Q9: subject resolution via per-purpose PurposeSubjectResolver.
  *   - Q10: optional sectionId for future section-level apply.
  *   - Q12: hierarchical activity log via BindingActivityLogger.
+ *   - v1.3 Q1 add 4: optional deadline (withDeadline()) — soft post-call
+ *     microtime check throwing FormBindingApplicatorTimeoutException.
+ *     Cannot interrupt mid-query; intended to catch the long-tail of
+ *     slow applies before they hang the public flow.
  */
 // Not final + not readonly: listener tests need to override `apply()` for
 // throw-path coverage (Mockery can't mock final classes; PHP doesn't allow
@@ -35,6 +40,15 @@ use Throwable;
 // individually to preserve immutability.
 class FormBindingApplicator
 {
+    /**
+     * Per RFC-WS-6 §Q1 v1.3 addition 4 — soft deadline (seconds). NULL
+     * means "no deadline check" (default). Set via withDeadline() so the
+     * value travels with a clone and the original instance stays
+     * deadline-free for other callers (e.g. the retry-service path,
+     * which currently does not bound apply() — see ARCH-BINDINGS §5.3).
+     */
+    private ?int $deadlineSeconds = null;
+
     public function __construct(
         private readonly PurposeRegistry $purposeRegistry,
         private readonly BindingConflictResolver $conflictResolver,
@@ -42,11 +56,34 @@ class FormBindingApplicator
         private readonly BindingActivityLogger $activityLogger,
     ) {}
 
+    /**
+     * Returns a clone configured to throw FormBindingApplicatorTimeoutException
+     * if apply() exceeds the given deadline.
+     *
+     * Per RFC-WS-6 §Q1 v1.3 addition 4 + ARCH-BINDINGS §5.3.
+     *
+     * Implementation note: this is a soft post-call deadline check via
+     * microtime. It cannot interrupt mid-query — for that, configure MySQL
+     * connection timeouts at the database driver level. The soft deadline
+     * is sufficient to prevent runaway apply() calls from hanging the
+     * public flow indefinitely; a typical apply() takes <100ms, so a 5s
+     * deadline catches the long tail.
+     */
+    public function withDeadline(int $seconds): self
+    {
+        $clone = clone $this;
+        $clone->deadlineSeconds = $seconds;
+
+        return $clone;
+    }
+
     /**
      * @throws FormBindingApplicatorException
      */
     public function apply(FormSubmission $submission, ?string $sectionId = null): BindingPassResult
     {
+        $start = microtime(true);
+
         if (DB::transactionLevel() < 1) {
             throw new FormBindingInfraException(
                 submissionId: (string) $submission->id,
@@ -81,38 +118,61 @@ class FormBindingApplicator
                 provisionedSubjectId: null,
                 applications: [],
             );
-            $this->activityLogger->logPass($submission, $result);
+        } else {
+            $resolved = $this->conflictResolver->resolve($submission, $sectionId);
 
-            return $result;
-        }
-
-        $resolved = $this->conflictResolver->resolve($submission, $sectionId);
-
-        // Persist subject identity for the result + apply each binding.
-        $applications = [];
-        foreach ($resolved as $binding) {
-            // Skip identity-key bindings — the resolver already used them
-            // for subject lookup in EventRegistration's PersonProvisioner
-            // path. Writing them again is a no-op at best, a clobber at
-            // worst.
-            if ($binding->isIdentityKey) {
-                continue;
+            // Persist subject identity for the result + apply each binding.
+            $applications = [];
+            foreach ($resolved as $binding) {
+                // Skip identity-key bindings — the resolver already used them
+                // for subject lookup in EventRegistration's PersonProvisioner
+                // path. Writing them again is a no-op at best, a clobber at
+                // worst.
+                if ($binding->isIdentityKey) {
+                    continue;
+                }
+                $applications[] = $this->applyOne($subject, $binding);
             }
-            $applications[] = $this->applyOne($subject, $binding);
-        }
 
-        $result = new BindingPassResult(
-            formSubmissionId: (string) $submission->id,
-            provisionedSubjectType: $this->morphAlias($subject),
-            provisionedSubjectId: (string) $subject->getKey(),
-            applications: $applications,
-        );
+            $result = new BindingPassResult(
+                formSubmissionId: (string) $submission->id,
+                provisionedSubjectType: $this->morphAlias($subject),
+                provisionedSubjectId: (string) $subject->getKey(),
+                applications: $applications,
+            );
+        }
 
         $this->activityLogger->logPass($submission, $result);
 
+        $this->checkDeadline((string) $submission->id, $start);
+
         return $result;
     }
 
+    /**
+     * Throws FormBindingApplicatorTimeoutException if a deadline is
+     * configured and the elapsed wall-clock time exceeds it.
+     */
+    private function checkDeadline(string $submissionId, float $startMicrotime): void
+    {
+        if ($this->deadlineSeconds === null) {
+            return;
+        }
+
+        $elapsed = microtime(true) - $startMicrotime;
+        if ($elapsed > $this->deadlineSeconds) {
+            throw new FormBindingApplicatorTimeoutException(
+                submissionId: $submissionId,
+                message: sprintf(
+                    'FormBindingApplicator exceeded deadline of %ds (elapsed: %.2fs) for submission %s',
+                    $this->deadlineSeconds,
+                    $elapsed,
+                    $submissionId,
+                ),
+            );
+        }
+    }
+
     private function applyOne(Model $subject, ResolvedBinding $binding): BindingApplicationResult
     {
         try {
diff --git a/api/app/Listeners/FormBuilder/ApplyBindingsOnFormSubmit.php b/api/app/Listeners/FormBuilder/ApplyBindingsOnFormSubmit.php
index e6a8fd12..42e10ad2 100644
--- a/api/app/Listeners/FormBuilder/ApplyBindingsOnFormSubmit.php
+++ b/api/app/Listeners/FormBuilder/ApplyBindingsOnFormSubmit.php
@@ -6,7 +6,9 @@ namespace App\Listeners\FormBuilder;
 
 use App\Enums\FormBuilder\ApplyStatus;
 use App\Events\FormBuilder\FormSubmissionSubmitted;
+use App\Exceptions\FormBuilder\FormBindingApplicatorException;
 use App\FormBuilder\Bindings\FormBindingApplicator;
+use App\FormBuilder\Bindings\FormBindingExceptionClassifier;
 use App\Models\FormBuilder\FormSchema;
 use App\Models\FormBuilder\FormSubmission;
 use App\Models\FormBuilder\FormSubmissionActionFailure;
@@ -21,10 +23,24 @@ use Throwable;
  * FormSubmissionActionFailure in a separate transaction (survives
  * inner rollback).
  *
+ * v1.3 changes (per RFC v1.3.1 + ARCH-BINDINGS v1.2):
+ *   - Q1 addition 1: writes identity_match_status='pending' inside the
+ *     inner transaction so the HTTP response carries the right state
+ *     for the IdentityMatchBanner first-paint copy. Final state is
+ *     written by the queued TriggerPersonIdentityMatch.
+ *   - Q1 addition 4: wraps applicator with config-driven deadline so
+ *     a runaway apply() throws FormBindingApplicatorTimeoutException
+ *     instead of hanging the public flow.
+ *   - Q3 addition 2: outer-transaction catch uses
+ *     FormBindingExceptionClassifier::classify to write
+ *     failure_response_code on the parent submission. The action-failure
+ *     row is the canonical machine-replayable artefact; the column is
+ *     the response-shape driver.
+ *
  * Throws are swallowed (RFC Q3) — sibling listeners must keep running.
  *
- * SYNCHRONOUS by design — does NOT implement ShouldQueue. Identity
- * match runs after this in the registered listener order.
+ * SYNCHRONOUS by design — does NOT implement ShouldQueue. Identity-match
+ * runs queued (post-v1.3) and is gated on apply_status=COMPLETED.
  */
 final readonly class ApplyBindingsOnFormSubmit
 {
@@ -37,28 +53,40 @@ final readonly class ApplyBindingsOnFormSubmit
             return;
         }
 
-        try {
-            DB::transaction(function () use ($submission): void {
-                $result = $this->applicator->apply($submission);
+        $deadlineSeconds = (int) config('form_builder.apply_deadline_seconds', 5);
 
-                FormSubmission::query()
-                    ->whereKey($submission->id)
-                    ->update([
-                        'apply_status' => $result->applyStatus()->value,
-                        'apply_completed_at' => now(),
-                    ]);
+        try {
+            DB::transaction(function () use ($submission, $deadlineSeconds): void {
+                $result = $this->applicator
+                    ->withDeadline($deadlineSeconds)
+                    ->apply($submission);
+
+                $updates = [
+                    'apply_status' => $result->applyStatus()->value,
+                    'apply_completed_at' => now(),
+                ];
+
+                // Initial identity_match_status='pending' write (RFC §Q1
+                // v1.3 addition 1). Only meaningful when ApplyBindings
+                // produced a person subject; non-person purposes leave
+                // the column NULL per ARCH-BINDINGS §7.3 contract.
+                if ($result->provisionedSubjectType === 'person'
+                    || $submission->subject_type === 'person') {
+                    $updates['identity_match_status'] = 'pending';
+                }
 
                 if ($result->provisionedSubjectType !== null && $submission->subject_type === null) {
                     // ApplyBindings just provisioned a Person; reflect it
                     // on the submission so TriggerPersonIdentityMatch (next
-                    // sync listener) can find it.
-                    FormSubmission::query()
-                        ->whereKey($submission->id)
-                        ->update([
-                            'subject_type' => $result->provisionedSubjectType,
-                            'subject_id' => $result->provisionedSubjectId,
-                        ]);
+                    // queued listener) can find it and the gating-invariant
+                    // sees a coherent (subject_type, subject_id) pair.
+                    $updates['subject_type'] = $result->provisionedSubjectType;
+                    $updates['subject_id'] = $result->provisionedSubjectId;
                 }
+
+                FormSubmission::query()
+                    ->whereKey($submission->id)
+                    ->update($updates);
             });
         } catch (Throwable $e) {
             // OUTSIDE the failed transaction — survives rollback.
@@ -74,6 +102,9 @@ final readonly class ApplyBindingsOnFormSubmit
                     'exception_trace' => $e->getTraceAsString(),
                     'context' => [
                         'purpose' => $purposeValue,
+                        'submission_id' => $e instanceof FormBindingApplicatorException
+                            ? $e->submissionId
+                            : (string) $submission->id,
                     ],
                 ]);
                 FormSubmission::query()
@@ -81,6 +112,7 @@ final readonly class ApplyBindingsOnFormSubmit
                     ->update([
                         'apply_status' => ApplyStatus::FAILED->value,
                         'apply_completed_at' => now(),
+                        'failure_response_code' => FormBindingExceptionClassifier::classify($e),
                     ]);
             });
             Log::error('form-builder.apply.transaction_rolled_back', [
diff --git a/api/app/Listeners/FormBuilder/SyncTagPickerSelectionsOnSubmit.php b/api/app/Listeners/FormBuilder/SyncTagPickerSelectionsOnSubmit.php
index d8504bab..62a3dd2e 100644
--- a/api/app/Listeners/FormBuilder/SyncTagPickerSelectionsOnSubmit.php
+++ b/api/app/Listeners/FormBuilder/SyncTagPickerSelectionsOnSubmit.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace App\Listeners\FormBuilder;
 
+use App\Enums\FormBuilder\ApplyStatus;
 use App\Enums\FormBuilder\FormFieldType;
 use App\Enums\FormBuilder\FormPurpose;
 use App\Events\FormBuilder\FormSubmissionSubmitted;
@@ -24,6 +25,11 @@ use Illuminate\Support\Facades\Log;
  * person's linked user. No-ops when person.user_id is null (deferred
  * sync runs on PersonIdentityService::confirmMatch).
  *
+ * Gating-invariant first statement per ARCH-BINDINGS §5.6: skip unless
+ * apply_status is COMPLETED. PARTIAL and FAILED both fall through —
+ * rebuilding tags against a Person whose tag-binding may have been the
+ * binding that failed would propagate partial state into derived data.
+ *
  * Failure mode: log at error level; never throw. Event propagation must
  * reach sibling listeners (§31.1 identity, §31.3 shifts, §31.8 crowd lists).
  */
@@ -43,11 +49,25 @@ final class SyncTagPickerSelectionsOnSubmit implements ShouldQueue
     public function handle(FormSubmissionSubmitted $event): void
     {
         try {
+            // Gating-invariant first statement per ARCH-BINDINGS §5.6.
+            // The fresh() reload is required because the inner-txn commit
+            // happens between dispatch and worker pickup; the in-memory
+            // event submission may carry pre-commit state.
             $submission = $event->submission->fresh(['schema']);
             if ($submission === null) {
                 return;
             }
 
+            if ($submission->apply_status !== ApplyStatus::COMPLETED) {
+                Log::info('form-builder.queued-listener.skipped_apply_failed', [
+                    'listener' => self::class,
+                    'submission_id' => (string) $submission->id,
+                    'apply_status' => $submission->apply_status?->value,
+                ]);
+
+                return;
+            }
+
             $schema = $submission->schema;
             if ($schema === null) {
                 return;
diff --git a/api/app/Listeners/FormBuilder/TriggerPersonIdentityMatchOnFormSubmit.php b/api/app/Listeners/FormBuilder/TriggerPersonIdentityMatchOnFormSubmit.php
index da006082..9065bf43 100644
--- a/api/app/Listeners/FormBuilder/TriggerPersonIdentityMatchOnFormSubmit.php
+++ b/api/app/Listeners/FormBuilder/TriggerPersonIdentityMatchOnFormSubmit.php
@@ -4,112 +4,139 @@ declare(strict_types=1);
 
 namespace App\Listeners\FormBuilder;
 
+use App\Enums\FormBuilder\ApplyStatus;
 use App\Enums\FormBuilder\FormPurpose;
+use App\Events\FormBuilder\FormSubmissionIdentityMatchResolved;
 use App\Events\FormBuilder\FormSubmissionSubmitted;
+use App\Exceptions\FormBuilder\IdentityMatchInvariantViolation;
 use App\Models\FormBuilder\FormSubmission;
 use App\Models\Person;
 use App\Services\PersonIdentityService;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Queue\InteractsWithQueue;
 use Illuminate\Support\Facades\Log;
 
 /**
- * ARCH §31.1 — trigger PersonIdentityService::detectMatches on
- * event_registration submissions and record the outcome on the
- * submission so the portal can tell the submitter what's happening.
+ * RFC-WS-6 §Q1 v1.3 (queued) + §Q2 (invariant) + §Q1 v1.3 addition 2 (broadcast).
+ *
+ * Runs asynchronously after ApplyBindingsOnFormSubmit commits. Identity
+ * matching joins the persons table scoped to organisation; in large orgs
+ * (10k+ Persons) this can take seconds at peak load. Keeping it sync would
+ * block PHP-FPM workers during public-form submission spikes — operationally
+ * unacceptable for enterprise SaaS. The IdentityMatchBanner first-paint
+ * copy stays correct because ApplyBindingsOnFormSubmit writes
+ * identity_match_status='pending' inside its inner transaction; this
+ * listener writes the final state and broadcasts on the
+ * `submission.{id}` private channel so the frontend can refetch.
+ *
+ * Gating-invariant per ARCH-BINDINGS §5.6: skip unless apply_status is
+ * COMPLETED. PARTIAL and FAILED both fall through to the early-return —
+ * sibling state is incoherent, identity-match against possibly-half-applied
+ * data is meaningless.
+ *
+ * The post-ApplyBindings invariant per §Q2: subject_type='person' AND
+ * subject_id IS NOT NULL, OR apply_status=FAILED. No third state exists.
+ * If we see subject_type='person' AND subject_id IS NULL AND
+ * apply_status=COMPLETED, that's a structural defect — strict throw via
+ * IdentityMatchInvariantViolation routes to GlitchTip + (via the queue
+ * exception handler) form_submission_action_failures.
  *
  * States written to form_submissions.identity_match_status:
  *   - 'matched' — the person is already linked to a user account
- *   - 'pending' — one or more PersonIdentityMatch(pending) rows exist
- *                 OR the submission is public (no subject yet; organiser
- *                 will attach a person and matching runs later)
- *   - 'none'    — the person exists, is unlinked, and nothing matched
- *
- * Failure mode per §31.1: log at error level, never rethrow so sibling
- * listeners on the same event (§31.10 tag sync, §31.3 shift provisioning)
- * keep running.
- *
- * Runs synchronously (no ShouldQueue) so identity_match_status is
- * already written by the time the HTTP submit-response serialises the
- * submission — the portal's IdentityMatchBanner then renders on first
- * confirmation-page load instead of after a queue worker tick. When
- * FORM-05 proper adds heavier value-based matching, that work will
- * dispatch as a separate queued job from within this listener so the
- * eager state transition stays sync and the slow resolution stays
- * async.
+ *   - 'pending' — one or more PersonIdentityMatch(pending) candidates exist
+ *   - 'none'    — no candidates and not linked
  */
-final class TriggerPersonIdentityMatchOnFormSubmit
+final class TriggerPersonIdentityMatchOnFormSubmit implements ShouldQueue
 {
+    use InteractsWithQueue;
+
+    // Default queue connection — redis in production, sync in tests.
+    public string $queue = 'default';
+
     public function __construct(
         private readonly PersonIdentityService $identityService,
     ) {}
 
     public function handle(FormSubmissionSubmitted $event): void
     {
-        try {
-            $submission = $event->submission->fresh(['schema']);
-            if ($submission === null) {
-                return;
-            }
-
-            $schema = $submission->schema;
-            if ($schema === null) {
-                return;
-            }
-
-            $purpose = $schema->purpose instanceof \BackedEnum
-                ? $schema->purpose->value
-                : (string) $schema->purpose;
-
-            if ($purpose !== FormPurpose::EVENT_REGISTRATION->value) {
-                return;
-            }
-
-            $status = $this->resolveStatus($submission);
-
-            // Use a raw UPDATE so we don't re-fire Eloquent events / an
-            // observer cascade on the submission itself.
-            FormSubmission::query()
-                ->whereKey($submission->id)
-                ->update(['identity_match_status' => $status]);
-        } catch (\Throwable $e) {
-            Log::error('form-builder.identity-match.listener_failed', [
-                'submission_id' => $event->submission->id,
-                'message' => $e->getMessage(),
-            ]);
+        // Gating-invariant first statement per ARCH-BINDINGS §5.6.
+        // The fresh() reload is required because the inner-txn commit +
+        // outer-txn failure-record write happens between dispatch and
+        // worker pickup; the in-memory event submission may be stale.
+        $submission = $event->submission->fresh(['schema']);
+        if (! $submission instanceof FormSubmission) {
+            return;
         }
-    }
 
-    private function resolveStatus(FormSubmission $submission): string
-    {
-        if ($submission->subject_type !== 'person' || $submission->subject_id === null) {
-            // Post-WS-6 (RFC Q2): this path should be unreachable for
-            // event_registration submissions because ApplyBindingsOnFormSubmit
-            // provisions the Person synchronously before this listener fires.
-            // If we reach here, either:
-            //   - ApplyBindings failed silently (check form_submission_action_failures)
-            //   - Schema is misconfigured (no email binding, no identity-key)
-            //   - Different purpose where subject genuinely is null
-            // Failsafe: preserve the existing 'pending' state so portal banner
-            // still renders sensibly, and surface the misconfiguration in logs.
-            Log::warning('form-builder.identity-match.no_person_subject_post_apply', [
+        if ($submission->apply_status !== ApplyStatus::COMPLETED) {
+            Log::info('form-builder.queued-listener.skipped_apply_failed', [
+                'listener' => self::class,
                 'submission_id' => (string) $submission->id,
-                'schema_id' => (string) $submission->form_schema_id,
-                'subject_type' => $submission->subject_type,
+                'apply_status' => $submission->apply_status?->value,
             ]);
 
-            return 'pending';
+            return;
+        }
+
+        // Non-event_registration purposes: no-op by design. Identity-match
+        // is a person-resolution flow specific to public registration.
+        $schema = $submission->schema;
+        if ($schema === null) {
+            return;
+        }
+        $purpose = $schema->purpose instanceof \BackedEnum
+            ? $schema->purpose->value
+            : (string) $schema->purpose;
+        if ($purpose !== FormPurpose::EVENT_REGISTRATION->value) {
+            return;
+        }
+
+        // Non-person subjects on event_registration: also a no-op (defensive).
+        if ($submission->subject_type !== 'person') {
+            return;
+        }
+
+        // Invariant per §Q2: subject_id IS NOT NULL when apply_status=COMPLETED
+        // and subject_type='person'. Violation = structural defect.
+        if ($submission->subject_id === null) {
+            throw new IdentityMatchInvariantViolation(sprintf(
+                "subject_type='person' but subject_id=null after ApplyBindings COMPLETED. submission_id=%s",
+                $submission->id,
+            ));
         }
 
         $person = Person::withoutGlobalScopes()->find($submission->subject_id);
         if ($person === null) {
-            return 'none';
-        }
+            // The person was deleted between ApplyBindings COMPLETED and this
+            // worker pickup. Rare but possible; treat as a no-match terminal
+            // state so the banner shows a sensible final copy.
+            FormSubmission::query()
+                ->whereKey($submission->id)
+                ->update(['identity_match_status' => 'none']);
 
-        if ($person->user_id !== null) {
-            return 'matched';
+            return;
         }
 
         $matches = $this->identityService->detectMatches($person);
+        $status = match (true) {
+            $person->user_id !== null => 'matched',
+            $matches->isNotEmpty() => 'pending',
+            default => 'none',
+        };
 
-        return $matches->isNotEmpty() ? 'pending' : 'none';
+        FormSubmission::query()
+            ->whereKey($submission->id)
+            ->update(['identity_match_status' => $status]);
+
+        // Per RFC §Q1 v1.3 addition 2 — broadcast on the submission's
+        // private channel so the frontend portal IdentityMatchBanner can
+        // refetch the submission resource and transition copy from
+        // "we're checking matches…" to the final state without a manual
+        // reload. matchCount is an ephemeral DTO field; not persisted.
+        broadcast(new FormSubmissionIdentityMatchResolved(
+            submissionId: (string) $submission->id,
+            status: $status,
+            matchCount: $matches->count(),
+        ))->toOthers();
     }
 }
diff --git a/api/app/Providers/AppServiceProvider.php b/api/app/Providers/AppServiceProvider.php
index f16031bd..a0718ada 100644
--- a/api/app/Providers/AppServiceProvider.php
+++ b/api/app/Providers/AppServiceProvider.php
@@ -163,16 +163,24 @@ class AppServiceProvider extends ServiceProvider
         FormField::observe(FormFieldChildTablesCascadeObserver::class);
         FormFieldLibrary::observe(FormFieldChildTablesCascadeObserver::class);
 
-        // RFC-WS-6 §3 (Q1) — sync chain on FormSubmissionSubmitted, in
-        // this exact order:
-        //   1. ApplyBindingsOnFormSubmit                (sync)
-        //   2. TriggerPersonIdentityMatchOnFormSubmit   (sync)
-        // Queued listeners on the same event (SyncTagPickerSelectionsOnSubmit,
-        // future webhook dispatcher, mailables) run in parallel after the
-        // sync chain via the queue. Their relative registration position
-        // is irrelevant.
+        // RFC-WS-6 v1.3 §Q1 — FormSubmissionSubmitted listener layout.
+        //
+        // SYNC chain (single listener):
+        //   1. ApplyBindingsOnFormSubmit
+        //
+        // QUEUED listeners (parallel, all gated on apply_status=COMPLETED
+        // per ARCH-BINDINGS §5.6 — PARTIAL and FAILED both fall through to
+        // the early-return):
+        //   - TriggerPersonIdentityMatchOnFormSubmit (gates + invariant + broadcast)
+        //   - SyncTagPickerSelectionsOnSubmit
+        //
+        // The listener-ordering structural test
+        // (FormSubmissionSubmittedListenerOrderTest) asserts ApplyBindings
+        // is the only sync listener and that every queued listener has
+        // the apply_status=COMPLETED gate as its first executable
+        // statement.
 
-        // RFC Q1 — applies bindings sync before identity match runs.
+        // RFC Q1 — applies bindings sync before queued siblings fire.
         \Illuminate\Support\Facades\Event::listen(
             FormSubmissionSubmitted::class,
             ApplyBindingsOnFormSubmit::class,
@@ -184,7 +192,8 @@ class AppServiceProvider extends ServiceProvider
             SyncTagPickerSelectionsOnSubmit::class,
         );
 
-        // ARCH §31.1 — identity-match trigger on event_registration (sync).
+        // ARCH §31.1 — identity-match trigger on event_registration (queued
+        // post-v1.3; was sync in v1.0/v1.2 layout).
         \Illuminate\Support\Facades\Event::listen(
             FormSubmissionSubmitted::class,
             TriggerPersonIdentityMatchOnFormSubmit::class,
diff --git a/api/app/Services/FormBuilder/FormFailureRetryService.php b/api/app/Services/FormBuilder/FormFailureRetryService.php
index 7361bf83..55a4c91a 100644
--- a/api/app/Services/FormBuilder/FormFailureRetryService.php
+++ b/api/app/Services/FormBuilder/FormFailureRetryService.php
@@ -8,6 +8,7 @@ use App\Enums\FormBuilder\ApplyStatus;
 use App\Exceptions\FormBuilder\FailureNotRetriableException;
 use App\Exceptions\FormBuilder\ParentSubmissionGoneException;
 use App\FormBuilder\Bindings\FormBindingApplicator;
+use App\FormBuilder\Bindings\FormBindingExceptionClassifier;
 use App\Models\FormBuilder\FormSubmission;
 use App\Models\FormBuilder\FormSubmissionActionFailure;
 use App\Models\FormBuilder\FormSubmissionActionFailureRetryAttempt;
@@ -30,6 +31,13 @@ use Throwable;
  *      exception details, increment retry_count. Parent's own
  *      exception_class / exception_message stay audit-immutable —
  *      they represent the FIRST failure.
+ *
+ * v1.3-delta D2 (per ARCH-BINDINGS §7.1 v1.2 + RFC-WS-6 §Q3 v1.3 addition 2):
+ *   - recordFailure now mirrors ApplyBindingsOnFormSubmit's outer-txn path:
+ *     writes failure_response_code via FormBindingExceptionClassifier and
+ *     apply_completed_at = now() (closes the asymmetry where the listener
+ *     wrote this column on both happy and failure paths but the retry
+ *     service only wrote it on the success path).
  */
 final readonly class FormFailureRetryService
 {
@@ -125,9 +133,18 @@ final readonly class FormFailureRetryService
                 ->whereKey($failure->id)
                 ->update(['retry_count' => DB::raw('retry_count + 1')]);
 
+            // Per ARCH-BINDINGS §7.1 v1.2 retry-service asymmetry note +
+            // RFC-WS-6 §Q3 v1.3 addition 2 — mirror ApplyBindingsOnFormSubmit's
+            // outer-transaction failure path: same failure_response_code
+            // classifier + apply_completed_at write. Single behaviour-change
+            // point per the v1.3-delta D1 design.
             FormSubmission::query()
                 ->whereKey($submission->id)
-                ->update(['apply_status' => ApplyStatus::FAILED->value]);
+                ->update([
+                    'apply_status' => ApplyStatus::FAILED->value,
+                    'apply_completed_at' => now(),
+                    'failure_response_code' => FormBindingExceptionClassifier::classify($e),
+                ]);
 
             return $attempt;
         });
diff --git a/api/bootstrap/app.php b/api/bootstrap/app.php
index 5d702be5..d8978393 100644
--- a/api/bootstrap/app.php
+++ b/api/bootstrap/app.php
@@ -19,6 +19,11 @@ return Application::configure(basePath: dirname(__DIR__))
         web: __DIR__.'/../routes/web.php',
         api: __DIR__.'/../routes/api.php',
         commands: __DIR__.'/../routes/console.php',
+        // Per RFC-WS-6 §Q1 v1.3 addition 2 — broadcast channel auth callbacks
+        // live in routes/channels.php. Registers Laravel's broadcasting auth
+        // middleware so private/presence channel subscriptions reach the
+        // closures defined there.
+        channels: __DIR__.'/../routes/channels.php',
         health: '/up',
         apiPrefix: 'api/v1',
     )
diff --git a/api/config/form_builder.php b/api/config/form_builder.php
index a1b99e0f..ae31ebb6 100644
--- a/api/config/form_builder.php
+++ b/api/config/form_builder.php
@@ -84,4 +84,28 @@ return [
      */
     'section_apply_enabled' => env('FORM_BUILDER_SECTION_APPLY', false),
 
+    /**
+     * FormBindingApplicator deadline in seconds.
+     *
+     * The wrapper around FormBindingApplicator::apply() throws
+     * FormBindingApplicatorTimeoutException if the call takes longer
+     * than this value. The exception is caught by
+     * ApplyBindingsOnFormSubmit's outer transaction handler and recorded
+     * as a form_submission_action_failures row with apply_status=FAILED,
+     * failure_response_code='temporary_error'.
+     *
+     * Default 5 seconds — typical apply() takes <100ms; the deadline
+     * catches the long tail (slow query against a massive person pool,
+     * lock-for-update wait that should have been resolved at the
+     * database level, etc.) before it hangs the public flow.
+     *
+     * Tune upward if a legitimate use-case surfaces (very large schemas
+     * with many bindings against multi-million-row entity tables). Tune
+     * downward if SLO requirements demand stricter response-time
+     * guarantees.
+     *
+     * Per RFC-WS-6 §Q1 v1.3 addition 4.
+     */
+    'apply_deadline_seconds' => env('FORM_BUILDER_APPLY_DEADLINE_SECONDS', 5),
+
 ];
diff --git a/api/routes/channels.php b/api/routes/channels.php
new file mode 100644
index 00000000..b6ec7bc2
--- /dev/null
+++ b/api/routes/channels.php
@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Models\FormBuilder\FormSubmission;
+use App\Models\User;
+use Illuminate\Support\Facades\Broadcast;
+
+/*
+|--------------------------------------------------------------------------
+| Broadcast Channel Authorization
+|--------------------------------------------------------------------------
+|
+| Channel-level authorization callbacks for private and presence channels.
+| Laravel's broadcasting auth middleware invokes these on subscription
+| attempts; returning truthy authorises, falsy denies.
+|
+| File registered in bootstrap/app.php via withRouting(channels: ...).
+| Without that registration this file is dead code.
+|
+*/
+
+/*
+ * Per RFC-WS-6 §Q1 v1.3 addition 2.
+ *
+ * Authorises private subscriptions to a form-submission's identity-match
+ * resolution channel. The TriggerPersonIdentityMatchOnFormSubmit listener
+ * dispatches FormSubmissionIdentityMatchResolved on this channel after
+ * writing the final identity_match_status; the frontend portal
+ * IdentityMatchBanner subscribes via Echo.private('submission.{id}') and
+ * refetches the submission resource on receipt.
+ *
+ * v1 authz scope: only the submitter who created the submission via an
+ * authenticated session is allowed to subscribe. Org-admin access is
+ * deferred — see BACKLOG entry TECH-CHANNEL-AUTH-ORG-ADMIN. Public
+ * (token-based) submitters are not on this channel; their flow is
+ * already polling-based and they don't have a User to authenticate with.
+ */
+Broadcast::channel(
+    'submission.{submissionId}',
+    function (User $user, string $submissionId): bool {
+        $submission = FormSubmission::query()
+            ->withoutGlobalScopes()
+            ->find($submissionId);
+
+        if ($submission === null) {
+            return false;
+        }
+
+        // TODO TECH-CHANNEL-AUTH-ORG-ADMIN — extend to organisation admins
+        // once we audit the Spatie Permission helper for an
+        // organisation-scoped role check (hasRoleInOrganisation or
+        // similar). Until that audit lands, only the submitter has
+        // channel access.
+        return $submission->submitted_by_user_id === $user->id;
+    },
+);
diff --git a/api/tests/Feature/Api/V1/Public/FormBuilder/IdentityMatchOnSubmitTest.php b/api/tests/Feature/Api/V1/Public/FormBuilder/IdentityMatchOnSubmitTest.php
index 33de6b51..5f633b2a 100644
--- a/api/tests/Feature/Api/V1/Public/FormBuilder/IdentityMatchOnSubmitTest.php
+++ b/api/tests/Feature/Api/V1/Public/FormBuilder/IdentityMatchOnSubmitTest.php
@@ -4,9 +4,11 @@ declare(strict_types=1);
 
 namespace Tests\Feature\Api\V1\Public\FormBuilder;
 
+use App\Enums\FormBuilder\ApplyStatus;
 use App\Enums\FormBuilder\FormFieldType;
 use App\Enums\FormBuilder\FormPurpose;
 use App\Events\FormBuilder\FormSubmissionSubmitted;
+use App\Listeners\FormBuilder\TriggerPersonIdentityMatchOnFormSubmit;
 use App\Models\CrowdType;
 use App\Models\Event;
 use App\Models\FormBuilder\FormField;
@@ -23,6 +25,12 @@ use Tests\TestCase;
  * ARCH §31.1 — TriggerPersonIdentityMatchOnFormSubmit contract.
  * Verifies: (a) only fires for event_registration, (b) matched/pending/
  * none states written correctly, (c) listener failures never rethrow.
+ *
+ * D2 update: post-RFC-WS-6 v1.3, the listener is queued + gated on
+ * apply_status=COMPLETED. These tests bypass the full submit pipeline
+ * (no real bindings configured) and directly invoke the listener with
+ * apply_status=COMPLETED pre-set on the submission, mirroring the
+ * gate-passing happy-path output of ApplyBindingsOnFormSubmit.
  */
 final class IdentityMatchOnSubmitTest extends TestCase
 {
@@ -59,6 +67,31 @@ final class IdentityMatchOnSubmitTest extends TestCase
         ]);
     }
 
+    /**
+     * Build a submission with apply_status=COMPLETED pre-set so the v1.3
+     * gate passes. Then invoke the listener directly — bypasses
+     * ApplyBindings (which would fail without a properly-configured
+     * schema with identity-key binding + default_crowd_type_id).
+     *
+     * @param  array<string, mixed>  $overrides
+     */
+    private function submitAndDispatch(array $overrides): FormSubmission
+    {
+        $submission = FormSubmission::factory()->create(array_merge([
+            'form_schema_id' => $this->schema->id,
+            'status' => 'submitted',
+            'submitted_at' => now(),
+        ], $overrides));
+
+        $submission->apply_status = ApplyStatus::COMPLETED;
+        $submission->save();
+
+        $listener = $this->app->make(TriggerPersonIdentityMatchOnFormSubmit::class);
+        $listener->handle(new FormSubmissionSubmitted($submission->fresh()));
+
+        return $submission->fresh();
+    }
+
     public function test_event_registration_triggers_matched_when_person_has_user(): void
     {
         $user = User::factory()->create();
@@ -68,17 +101,12 @@ final class IdentityMatchOnSubmitTest extends TestCase
             'user_id' => $user->id,
         ]);
 
-        $submission = FormSubmission::factory()->create([
-            'form_schema_id' => $this->schema->id,
+        $submission = $this->submitAndDispatch([
             'subject_type' => 'person',
             'subject_id' => $person->id,
-            'status' => 'submitted',
-            'submitted_at' => now(),
         ]);
 
-        FormSubmissionSubmitted::dispatch($submission->fresh());
-
-        $this->assertSame('matched', $submission->fresh()->identity_match_status);
+        $this->assertSame('matched', $submission->identity_match_status);
     }
 
     public function test_event_registration_triggers_none_when_person_unlinked_no_match(): void
@@ -92,17 +120,12 @@ final class IdentityMatchOnSubmitTest extends TestCase
             'last_name' => 'NoMatch',
         ]);
 
-        $submission = FormSubmission::factory()->create([
-            'form_schema_id' => $this->schema->id,
+        $submission = $this->submitAndDispatch([
             'subject_type' => 'person',
             'subject_id' => $person->id,
-            'status' => 'submitted',
-            'submitted_at' => now(),
         ]);
 
-        FormSubmissionSubmitted::dispatch($submission->fresh());
-
-        $this->assertSame('none', $submission->fresh()->identity_match_status);
+        $this->assertSame('none', $submission->identity_match_status);
     }
 
     public function test_event_registration_triggers_pending_when_matcher_finds_candidate(): void
@@ -122,17 +145,12 @@ final class IdentityMatchOnSubmitTest extends TestCase
             'last_name' => 'Match',
         ]);
 
-        $submission = FormSubmission::factory()->create([
-            'form_schema_id' => $this->schema->id,
+        $submission = $this->submitAndDispatch([
             'subject_type' => 'person',
             'subject_id' => $person->id,
-            'status' => 'submitted',
-            'submitted_at' => now(),
         ]);
 
-        FormSubmissionSubmitted::dispatch($submission->fresh());
-
-        $this->assertSame('pending', $submission->fresh()->identity_match_status);
+        $this->assertSame('pending', $submission->identity_match_status);
     }
 
     public function test_non_event_registration_purpose_does_not_trigger(): void
@@ -141,6 +159,7 @@ final class IdentityMatchOnSubmitTest extends TestCase
             'organisation_id' => $this->org->id,
             'purpose' => FormPurpose::INCIDENT_REPORT,
         ]);
+
         $submission = FormSubmission::factory()->create([
             'form_schema_id' => $otherSchema->id,
             'subject_type' => null,
@@ -148,13 +167,24 @@ final class IdentityMatchOnSubmitTest extends TestCase
             'status' => 'submitted',
             'submitted_at' => now(),
         ]);
+        $submission->apply_status = ApplyStatus::COMPLETED;
+        $submission->save();
 
-        FormSubmissionSubmitted::dispatch($submission->fresh());
+        $listener = $this->app->make(TriggerPersonIdentityMatchOnFormSubmit::class);
+        $listener->handle(new FormSubmissionSubmitted($submission->fresh()));
 
         $this->assertNull($submission->fresh()->identity_match_status);
     }
 
-    public function test_public_submission_marked_pending(): void
+    /**
+     * v1.3 contract change: the failsafe-pad ("subject_id null → write
+     * 'pending' + log warning") is gone. With apply_status=COMPLETED but
+     * subject_type='person' AND subject_id=null, the listener throws
+     * IdentityMatchInvariantViolation per RFC §Q2. With subject_type=null
+     * (this test's scenario), the listener simply returns at the
+     * subject-type check without writing anything.
+     */
+    public function test_public_submission_with_null_subject_does_not_write_status(): void
     {
         $submission = FormSubmission::factory()->create([
             'form_schema_id' => $this->schema->id,
@@ -163,9 +193,12 @@ final class IdentityMatchOnSubmitTest extends TestCase
             'status' => 'submitted',
             'submitted_at' => now(),
         ]);
+        $submission->apply_status = ApplyStatus::COMPLETED;
+        $submission->save();
 
-        FormSubmissionSubmitted::dispatch($submission->fresh());
+        $listener = $this->app->make(TriggerPersonIdentityMatchOnFormSubmit::class);
+        $listener->handle(new FormSubmissionSubmitted($submission->fresh()));
 
-        $this->assertSame('pending', $submission->fresh()->identity_match_status);
+        $this->assertNull($submission->fresh()->identity_match_status);
     }
 }
diff --git a/api/tests/Feature/FormBuilder/Bindings/FormBindingApplicatorDeadlineTest.php b/api/tests/Feature/FormBuilder/Bindings/FormBindingApplicatorDeadlineTest.php
new file mode 100644
index 00000000..c8b0700a
--- /dev/null
+++ b/api/tests/Feature/FormBuilder/Bindings/FormBindingApplicatorDeadlineTest.php
@@ -0,0 +1,149 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature\FormBuilder\Bindings;
+
+use App\Enums\FormBuilder\FormPurpose;
+use App\Exceptions\FormBuilder\FormBindingApplicatorTimeoutException;
+use App\FormBuilder\Bindings\BindingPassResult;
+use App\FormBuilder\Bindings\FormBindingApplicator;
+use App\Models\FormBuilder\FormSchema;
+use App\Models\FormBuilder\FormSubmission;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\DB;
+use Tests\TestCase;
+
+/**
+ * Per RFC-WS-6 §Q1 v1.3 addition 4 + ARCH-BINDINGS §5.3.
+ *
+ * The deadline wrapper is a soft post-call microtime check. It cannot
+ * interrupt mid-query; it catches the long tail of slow applies before
+ * they hang the public flow.
+ *
+ * Uses incident_report purpose with a null submitter so the applicator
+ * takes the anonymous-allowed branch — apply() returns an empty
+ * BindingPassResult without provisioning a Person, and the deadline
+ * check still fires at the end of apply(). Avoids the persons-table
+ * NOT NULL constraints that an event_registration fixture would
+ * otherwise need full first/last_name bindings to satisfy.
+ */
+final class FormBindingApplicatorDeadlineTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_with_deadline_returns_a_clone(): void
+    {
+        $applicator = $this->app->make(FormBindingApplicator::class);
+        $clone = $applicator->withDeadline(5);
+
+        $this->assertInstanceOf(FormBindingApplicator::class, $clone);
+        $this->assertNotSame($applicator, $clone, 'withDeadline must return a clone, not mutate the receiver');
+    }
+
+    public function test_apply_without_deadline_does_not_throw_for_fast_runs(): void
+    {
+        $submission = $this->makeAnonymousSubmission();
+        $applicator = $this->app->make(FormBindingApplicator::class);
+
+        DB::transaction(function () use ($applicator, $submission): void {
+            $result = $applicator->apply($submission);
+            $this->assertInstanceOf(BindingPassResult::class, $result);
+        });
+    }
+
+    public function test_apply_with_generous_deadline_does_not_throw(): void
+    {
+        $submission = $this->makeAnonymousSubmission();
+        $applicator = $this->app->make(FormBindingApplicator::class);
+
+        DB::transaction(function () use ($applicator, $submission): void {
+            $result = $applicator->withDeadline(60)->apply($submission);
+            $this->assertInstanceOf(BindingPassResult::class, $result);
+        });
+    }
+
+    public function test_apply_throws_timeout_when_elapsed_exceeds_deadline(): void
+    {
+        $submission = $this->makeAnonymousSubmission();
+        $applicator = new SlowApplicator(
+            $this->app->make(\App\FormBuilder\Purposes\PurposeRegistry::class),
+            $this->app->make(\App\FormBuilder\Bindings\BindingConflictResolver::class),
+            $this->app->make(\App\FormBuilder\Bindings\BindingTypeRegistry::class),
+            $this->app->make(\App\FormBuilder\Bindings\BindingActivityLogger::class),
+        );
+        $applicator->sleepMicroseconds = 50_000; // 50ms
+
+        $this->expectException(FormBindingApplicatorTimeoutException::class);
+        $this->expectExceptionMessageMatches('/exceeded deadline of 0s/');
+
+        DB::transaction(function () use ($applicator, $submission): void {
+            // 0 seconds — any wall-clock elapsed should exceed it.
+            $applicator->withDeadline(0)->apply($submission);
+        });
+    }
+
+    public function test_timeout_exception_carries_submission_id_and_reason_code(): void
+    {
+        $submission = $this->makeAnonymousSubmission();
+        $applicator = new SlowApplicator(
+            $this->app->make(\App\FormBuilder\Purposes\PurposeRegistry::class),
+            $this->app->make(\App\FormBuilder\Bindings\BindingConflictResolver::class),
+            $this->app->make(\App\FormBuilder\Bindings\BindingTypeRegistry::class),
+            $this->app->make(\App\FormBuilder\Bindings\BindingActivityLogger::class),
+        );
+        $applicator->sleepMicroseconds = 50_000;
+
+        $caught = null;
+        try {
+            DB::transaction(function () use ($applicator, $submission): void {
+                $applicator->withDeadline(0)->apply($submission);
+            });
+        } catch (FormBindingApplicatorTimeoutException $e) {
+            $caught = $e;
+        }
+
+        $this->assertNotNull($caught);
+        $this->assertSame((string) $submission->id, $caught->submissionId);
+        // Inherited via FormBindingInfraException — Timeout extends Infra.
+        $this->assertSame('temporary_error', $caught->reasonCode());
+    }
+
+    /**
+     * Anonymous incident-report submission: the applicator's
+     * IncidentReportSubjectResolver returns null when submitted_by_user_id
+     * is null, and the applicator's anonymous-allowed branch returns an
+     * empty BindingPassResult. The deadline check still fires at the end.
+     */
+    private function makeAnonymousSubmission(): FormSubmission
+    {
+        $schema = FormSchema::factory()->create([
+            'purpose' => FormPurpose::INCIDENT_REPORT->value,
+        ]);
+
+        $submission = FormSubmission::factory()->create([
+            'form_schema_id' => $schema->id,
+            'subject_type' => null,
+            'subject_id' => null,
+            'submitted_by_user_id' => null,
+        ]);
+
+        return $submission->fresh();
+    }
+}
+
+/**
+ * Test double — sleeps inside apply() to force the deadline check at
+ * the end of apply() to fail for any reasonable deadline value (incl. 0).
+ */
+final class SlowApplicator extends FormBindingApplicator
+{
+    public int $sleepMicroseconds = 0;
+
+    public function apply(FormSubmission $submission, ?string $sectionId = null): BindingPassResult
+    {
+        usleep($this->sleepMicroseconds);
+
+        return parent::apply($submission, $sectionId);
+    }
+}
diff --git a/api/tests/Feature/FormBuilder/Bindings/RetryServiceFailureClassifierTest.php b/api/tests/Feature/FormBuilder/Bindings/RetryServiceFailureClassifierTest.php
new file mode 100644
index 00000000..cbe0ff5c
--- /dev/null
+++ b/api/tests/Feature/FormBuilder/Bindings/RetryServiceFailureClassifierTest.php
@@ -0,0 +1,160 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature\FormBuilder\Bindings;
+
+use App\Enums\FormBuilder\ApplyStatus;
+use App\Enums\FormBuilder\FormPurpose;
+use App\Exceptions\FormBuilder\FormBindingApplicatorTimeoutException;
+use App\Exceptions\FormBuilder\FormBindingDataIntegrityException;
+use App\Exceptions\FormBuilder\FormBindingInfraException;
+use App\Exceptions\FormBuilder\FormBindingSchemaConfigException;
+use App\FormBuilder\Bindings\BindingPassResult;
+use App\FormBuilder\Bindings\FormBindingApplicator;
+use App\Models\FormBuilder\FormSchema;
+use App\Models\FormBuilder\FormSubmission;
+use App\Models\FormBuilder\FormSubmissionActionFailure;
+use App\Models\Organisation;
+use App\Services\FormBuilder\FormFailureRetryService;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use RuntimeException;
+use Tests\TestCase;
+
+/**
+ * Per ARCH-BINDINGS §7.1 v1.2 + RFC-WS-6 §Q3 v1.3 addition 2.
+ *
+ * D2 wires FormBindingExceptionClassifier into
+ * FormFailureRetryService::recordFailure so the retry-failure path
+ * mirrors ApplyBindingsOnFormSubmit's outer-transaction catch block:
+ *   - failure_response_code on the parent submission per the exception
+ *     subclass classification.
+ *   - apply_completed_at = now() (asymmetry fix per the v1.2 note).
+ */
+final class RetryServiceFailureClassifierTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private function makeFailure(): FormSubmissionActionFailure
+    {
+        $org = Organisation::factory()->create();
+        $schema = FormSchema::factory()->create([
+            'organisation_id' => $org->id,
+            'purpose' => FormPurpose::EVENT_REGISTRATION->value,
+        ]);
+        $submission = FormSubmission::factory()->create([
+            'form_schema_id' => $schema->id,
+            'organisation_id' => $org->id,
+        ]);
+
+        return FormSubmissionActionFailure::factory()
+            ->for($submission, 'submission')
+            ->create([
+                'exception_class' => 'OriginalException',
+                'exception_message' => 'first failure message',
+            ]);
+    }
+
+    /**
+     * @param  callable(FormSubmission, ?string): BindingPassResult  $apply
+     */
+    private function bindApplicator(callable $apply): void
+    {
+        $stub = new class($apply) extends FormBindingApplicator
+        {
+            /** @var callable(FormSubmission, ?string): BindingPassResult */
+            private $apply;
+
+            /** @param  callable(FormSubmission, ?string): BindingPassResult  $apply */
+            public function __construct(callable $apply)
+            {
+                $this->apply = $apply;
+            }
+
+            public function apply(FormSubmission $submission, ?string $sectionId = null): BindingPassResult
+            {
+                return ($this->apply)($submission, $sectionId);
+            }
+        };
+        $this->app->instance(FormBindingApplicator::class, $stub);
+    }
+
+    private function retryWithThrow(callable $throwFn): FormSubmissionActionFailure
+    {
+        $failure = $this->makeFailure();
+        $this->bindApplicator(fn () => $throwFn());
+
+        $service = $this->app->make(FormFailureRetryService::class);
+        $result = $service->retry($failure);
+
+        $this->assertSame('failed', $result['outcome']);
+
+        return $failure->fresh();
+    }
+
+    public function test_record_failure_writes_failure_response_code_for_schema_config(): void
+    {
+        $failure = $this->retryWithThrow(
+            fn () => throw new FormBindingSchemaConfigException(submissionId: 'x', message: 'cfg'),
+        );
+
+        $submission = FormSubmission::query()->withoutGlobalScopes()->find($failure->form_submission_id);
+        $this->assertSame('schema_config_error', $submission->failure_response_code);
+        $this->assertSame(ApplyStatus::FAILED, $submission->apply_status);
+    }
+
+    public function test_record_failure_writes_failure_response_code_for_infra(): void
+    {
+        $failure = $this->retryWithThrow(
+            fn () => throw new FormBindingInfraException(submissionId: 'x', message: 'infra'),
+        );
+
+        $submission = FormSubmission::query()->withoutGlobalScopes()->find($failure->form_submission_id);
+        $this->assertSame('temporary_error', $submission->failure_response_code);
+    }
+
+    public function test_record_failure_writes_failure_response_code_for_timeout(): void
+    {
+        // Timeout extends Infra → temporary_error inherited.
+        $failure = $this->retryWithThrow(
+            fn () => throw new FormBindingApplicatorTimeoutException(submissionId: 'x', message: 'deadline'),
+        );
+
+        $submission = FormSubmission::query()->withoutGlobalScopes()->find($failure->form_submission_id);
+        $this->assertSame('temporary_error', $submission->failure_response_code);
+    }
+
+    public function test_record_failure_writes_failure_response_code_for_data_integrity(): void
+    {
+        $failure = $this->retryWithThrow(
+            fn () => throw new FormBindingDataIntegrityException(submissionId: 'x', message: 'fk'),
+        );
+
+        $submission = FormSubmission::query()->withoutGlobalScopes()->find($failure->form_submission_id);
+        $this->assertSame('data_integrity_error', $submission->failure_response_code);
+    }
+
+    public function test_record_failure_writes_unknown_error_for_arbitrary_throwable(): void
+    {
+        $failure = $this->retryWithThrow(fn () => throw new RuntimeException('arbitrary'));
+
+        $submission = FormSubmission::query()->withoutGlobalScopes()->find($failure->form_submission_id);
+        $this->assertSame('unknown_error', $submission->failure_response_code);
+    }
+
+    public function test_record_failure_writes_apply_completed_at_symmetry_fix(): void
+    {
+        // Per ARCH-BINDINGS §7.1 v1.2 retry-service asymmetry note —
+        // pre-D2, recordFailure did NOT write apply_completed_at; only
+        // recordSuccess did. D2 closes the asymmetry.
+        $failure = $this->retryWithThrow(
+            fn () => throw new FormBindingInfraException(submissionId: 'x', message: 'transient'),
+        );
+
+        $submission = FormSubmission::query()->withoutGlobalScopes()->find($failure->form_submission_id);
+        $this->assertNotNull(
+            $submission->apply_completed_at,
+            'apply_completed_at must be set on the failure path; pre-D2 only the success path wrote it.',
+        );
+    }
+}
diff --git a/api/tests/Feature/FormBuilder/Channels/SubmissionChannelAuthTest.php b/api/tests/Feature/FormBuilder/Channels/SubmissionChannelAuthTest.php
new file mode 100644
index 00000000..b55616db
--- /dev/null
+++ b/api/tests/Feature/FormBuilder/Channels/SubmissionChannelAuthTest.php
@@ -0,0 +1,119 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature\FormBuilder\Channels;
+
+use App\Models\FormBuilder\FormSchema;
+use App\Models\FormBuilder\FormSubmission;
+use App\Models\Organisation;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Broadcast;
+use Tests\TestCase;
+
+/**
+ * Per RFC-WS-6 §Q1 v1.3 addition 2.
+ *
+ * The submission.{submissionId} private channel authorises only the
+ * submitter (user whose id matches submissions.submitted_by_user_id).
+ * Org-admin access is deferred — see BACKLOG entry
+ * TECH-CHANNEL-AUTH-ORG-ADMIN.
+ *
+ * Broadcast::auth() drives the same callback path that Laravel's
+ * broadcasting auth middleware uses on a websocket subscription
+ * attempt. Tests pose as authenticated users and assert the boolean
+ * outcome.
+ */
+final class SubmissionChannelAuthTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private function authoriseSubscription(?User $user, FormSubmission $submission): bool
+    {
+        // Resolve the channel callback registered in routes/channels.php.
+        // Broadcast::channel() returns the manager; Broadcast::driver()
+        // exposes the channel callbacks. The cleanest contract test is
+        // to call the callback directly via the registered closure
+        // returned by getChannels().
+        $channels = Broadcast::getChannels();
+        $name = "submission.{$submission->id}";
+
+        foreach ($channels as $pattern => $callback) {
+            // Pattern is 'submission.{submissionId}'; convert to a regex
+            // so we can match the concrete channel name.
+            $regex = '/^'.str_replace(['{submissionId}', '.'], ['([^.]+)', '\\.'], $pattern).'$/';
+            if (! preg_match($regex, $name, $matches)) {
+                continue;
+            }
+            $result = $callback($user, $matches[1]);
+
+            return (bool) $result;
+        }
+
+        $this->fail("No channel callback registered for {$name}");
+    }
+
+    private function makeSubmission(?User $submitter): FormSubmission
+    {
+        $org = Organisation::factory()->create();
+        $schema = FormSchema::factory()->create(['organisation_id' => $org->id]);
+
+        return FormSubmission::factory()->create([
+            'form_schema_id' => $schema->id,
+            'organisation_id' => $org->id,
+            'submitted_by_user_id' => $submitter?->id,
+        ]);
+    }
+
+    public function test_submitter_is_authorised(): void
+    {
+        $submitter = User::factory()->create();
+        $submission = $this->makeSubmission($submitter);
+
+        $this->assertTrue($this->authoriseSubscription($submitter, $submission));
+    }
+
+    public function test_other_authenticated_user_is_denied(): void
+    {
+        $submitter = User::factory()->create();
+        $other = User::factory()->create();
+        $submission = $this->makeSubmission($submitter);
+
+        $this->assertFalse($this->authoriseSubscription($other, $submission));
+    }
+
+    public function test_subscription_is_denied_when_submission_does_not_exist(): void
+    {
+        $user = User::factory()->create();
+
+        // Build a submission, then delete it so the FK lookup returns null.
+        $submission = $this->makeSubmission($user);
+        $submissionId = (string) $submission->id;
+        $submission->forceDelete();
+
+        // Reuse the submitter's User and a fake submission shell.
+        $shell = new FormSubmission;
+        $shell->id = $submissionId;
+
+        $this->assertFalse($this->authoriseSubscription($user, $shell));
+    }
+
+    public function test_org_admin_is_currently_denied_per_backlog_entry(): void
+    {
+        // Locks the v1 contract: even an org admin of the submission's
+        // organisation is denied because the canonical Spatie helper
+        // hasn't been audited yet. See BACKLOG entry
+        // TECH-CHANNEL-AUTH-ORG-ADMIN. When that lands, this test should
+        // flip to expectTrue() in the same PR as the auth-callback
+        // extension.
+        $orgAdmin = User::factory()->create();
+        $submitter = User::factory()->create();
+        $submission = $this->makeSubmission($submitter);
+
+        $this->assertFalse(
+            $this->authoriseSubscription($orgAdmin, $submission),
+            'V1 contract: org admins are NOT authorised. Flip with TECH-CHANNEL-AUTH-ORG-ADMIN.',
+        );
+    }
+}
diff --git a/api/tests/Feature/FormBuilder/FormSubmissionResourceIdentityMatchTest.php b/api/tests/Feature/FormBuilder/FormSubmissionResourceIdentityMatchTest.php
index 15cb9b97..5bc8cdf7 100644
--- a/api/tests/Feature/FormBuilder/FormSubmissionResourceIdentityMatchTest.php
+++ b/api/tests/Feature/FormBuilder/FormSubmissionResourceIdentityMatchTest.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Tests\Feature\FormBuilder;
 
+use App\Enums\FormBuilder\FormPurpose;
 use App\Enums\FormBuilder\FormSubmissionStatus;
 use App\Http\Resources\FormBuilder\FormSubmissionResource;
 use App\Models\FormBuilder\FormSchema;
@@ -13,6 +14,7 @@ use App\Models\User;
 use Database\Seeders\RoleSeeder;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Laravel\Sanctum\Sanctum;
+use PHPUnit\Framework\Attributes\DataProvider;
 use Tests\TestCase;
 
 /**
@@ -97,4 +99,53 @@ final class FormSubmissionResourceIdentityMatchTest extends TestCase
         $response->assertOk()
             ->assertJsonPath('data.identity_match.status', 'matched');
     }
+
+    /**
+     * Per RFC-WS-6 §Q2 v1.3 — for non-person purposes the identity_match
+     * block is null. ApplyBindings only writes identity_match_status='pending'
+     * when the subject is a person; non-person purposes leave the column
+     * NULL and the resource emits null. This test pins the contract per
+     * non-person purpose so a future refactor can't silently drift.
+     *
+     * `event_registration` is intentionally excluded — that purpose IS
+     * person-typed and identity_match is non-null after ApplyBindings runs.
+     *
+     * @return array<string, array{0: FormPurpose}>
+     */
+    public static function nonPersonPurposes(): array
+    {
+        return [
+            'signature_contract' => [FormPurpose::SIGNATURE_CONTRACT],
+            'user_profile' => [FormPurpose::USER_PROFILE],
+            'incident_report' => [FormPurpose::INCIDENT_REPORT],
+            'post_event_evaluation' => [FormPurpose::POST_EVENT_EVALUATION],
+            'supplier_intake' => [FormPurpose::SUPPLIER_INTAKE],
+            'artist_advance' => [FormPurpose::ARTIST_ADVANCE],
+        ];
+    }
+
+    #[DataProvider('nonPersonPurposes')]
+    public function test_identity_match_is_null_for_non_person_purpose(FormPurpose $purpose): void
+    {
+        $schema = FormSchema::factory()->create([
+            'organisation_id' => $this->org->id,
+            'purpose' => $purpose->value,
+        ]);
+
+        $submission = FormSubmission::create([
+            'form_schema_id' => $schema->id,
+            'status' => FormSubmissionStatus::SUBMITTED->value,
+            'submitted_at' => now(),
+            'is_test' => false,
+            // identity_match_status intentionally not set; for non-person
+            // purposes the column stays NULL.
+        ]);
+
+        $array = $this->toArray($submission);
+
+        $this->assertNull(
+            $array['identity_match'],
+            "FormSubmissionResource.identity_match must be null for non-person purpose '{$purpose->value}' per RFC-WS-6 §Q2 v1.3.",
+        );
+    }
 }
diff --git a/api/tests/Feature/FormBuilder/Integration/TagPickerSyncListenerTest.php b/api/tests/Feature/FormBuilder/Integration/TagPickerSyncListenerTest.php
index 35df4f12..3ba84a02 100644
--- a/api/tests/Feature/FormBuilder/Integration/TagPickerSyncListenerTest.php
+++ b/api/tests/Feature/FormBuilder/Integration/TagPickerSyncListenerTest.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Tests\Feature\FormBuilder\Integration;
 
+use App\Enums\FormBuilder\ApplyStatus;
 use App\Enums\FormBuilder\FormFieldType;
 use App\Enums\FormBuilder\FormPurpose;
 use App\Enums\FormBuilder\FormSubmissionStatus;
@@ -11,6 +12,7 @@ use App\Enums\IdentityMatchConfidence;
 use App\Enums\IdentityMatchMethod;
 use App\Enums\IdentityMatchStatus;
 use App\Events\FormBuilder\FormSubmissionSubmitted;
+use App\Listeners\FormBuilder\SyncTagPickerSelectionsOnSubmit;
 use App\Models\CrowdType;
 use App\Models\Event;
 use App\Models\FormBuilder\FormField;
@@ -237,9 +239,17 @@ final class TagPickerSyncListenerTest extends TestCase
         $value->value = $tagIds;
         $value->save();
 
-        // Fire the event manually (we bypass the service during this test
-        // to isolate the listener contract).
-        FormSubmissionSubmitted::dispatch($submission->fresh());
+        // Per ARCH-BINDINGS §5.6 — SyncTagPickerSelectionsOnSubmit is gated
+        // on apply_status === COMPLETED. These integration tests bypass the
+        // applicator (the schema has no bindings configured), so we set the
+        // gate-passing state explicitly and invoke the listener under test
+        // directly. Mirrors the original "bypass the service to isolate the
+        // listener contract" intent.
+        $submission->apply_status = ApplyStatus::COMPLETED;
+        $submission->save();
+
+        $listener = $this->app->make(SyncTagPickerSelectionsOnSubmit::class);
+        $listener->handle(new FormSubmissionSubmitted($submission->fresh()));
 
         return $submission;
     }
diff --git a/api/tests/Feature/FormBuilder/Listeners/ApplyBindingsOnFormSubmitTest.php b/api/tests/Feature/FormBuilder/Listeners/ApplyBindingsOnFormSubmitTest.php
index 081c5f28..451918d3 100644
--- a/api/tests/Feature/FormBuilder/Listeners/ApplyBindingsOnFormSubmitTest.php
+++ b/api/tests/Feature/FormBuilder/Listeners/ApplyBindingsOnFormSubmitTest.php
@@ -9,6 +9,11 @@ use App\Enums\FormBuilder\FormFieldBindingMergeStrategy;
 use App\Enums\FormBuilder\FormFieldType;
 use App\Enums\FormBuilder\FormPurpose;
 use App\Events\FormBuilder\FormSubmissionSubmitted;
+use App\Exceptions\FormBuilder\FormBindingApplicatorTimeoutException;
+use App\Exceptions\FormBuilder\FormBindingDataIntegrityException;
+use App\Exceptions\FormBuilder\FormBindingInfraException;
+use App\Exceptions\FormBuilder\FormBindingSchemaConfigException;
+use App\FormBuilder\Bindings\BindingPassResult;
 use App\FormBuilder\Bindings\FormBindingApplicator;
 use App\Listeners\FormBuilder\ApplyBindingsOnFormSubmit;
 use App\Models\CrowdType;
@@ -19,8 +24,8 @@ use App\Models\FormBuilder\FormSchema;
 use App\Models\FormBuilder\FormSubmission;
 use App\Models\FormBuilder\FormSubmissionActionFailure;
 use App\Models\FormBuilder\FormValue;
-use App\FormBuilder\Bindings\BindingPassResult;
 use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Config;
 use Illuminate\Support\Facades\Log;
 use Tests\TestCase;
 
@@ -40,11 +45,129 @@ final class ApplyBindingsOnFormSubmitTest extends TestCase
         $this->assertNotNull($reloaded->apply_completed_at);
     }
 
+    public function test_writes_initial_pending_to_identity_match_status_for_person_subject(): void
+    {
+        // Per RFC-WS-6 §Q1 v1.3 addition 1 — ApplyBindings writes the
+        // initial 'pending' identity_match_status inside its inner
+        // transaction so the HTTP response carries the right state for
+        // the IdentityMatchBanner first-paint copy.
+        $submission = $this->makeSubmission();
+
+        $listener = $this->app->make(ApplyBindingsOnFormSubmit::class);
+        $listener->handle(new FormSubmissionSubmitted($submission));
+
+        $reloaded = FormSubmission::query()->withoutGlobalScopes()->find($submission->id);
+        $this->assertSame('pending', $reloaded->identity_match_status);
+    }
+
+    public function test_writes_apply_completed_at_on_failure(): void
+    {
+        $submission = $this->makeSubmission();
+
+        $applicator = $this->throwingApplicator(\RuntimeException::class, 'boom');
+
+        Log::shouldReceive('error')->once();
+
+        $listener = new ApplyBindingsOnFormSubmit($applicator);
+        $listener->handle(new FormSubmissionSubmitted($submission));
+
+        $reloaded = FormSubmission::query()->withoutGlobalScopes()->find($submission->id);
+        $this->assertSame(ApplyStatus::FAILED, $reloaded->apply_status);
+        $this->assertNotNull($reloaded->apply_completed_at);
+    }
+
+    public function test_writes_failure_response_code_for_schema_config_exception(): void
+    {
+        $this->assertFailureResponseCode(
+            FormBindingSchemaConfigException::class,
+            'schema_config_error',
+        );
+    }
+
+    public function test_writes_failure_response_code_for_infra_exception(): void
+    {
+        $this->assertFailureResponseCode(
+            FormBindingInfraException::class,
+            'temporary_error',
+        );
+    }
+
+    public function test_writes_failure_response_code_for_data_integrity_exception(): void
+    {
+        $this->assertFailureResponseCode(
+            FormBindingDataIntegrityException::class,
+            'data_integrity_error',
+        );
+    }
+
+    public function test_writes_unknown_error_for_arbitrary_throwable(): void
+    {
+        $submission = $this->makeSubmission();
+        $applicator = $this->throwingApplicator(\RuntimeException::class, 'boom');
+
+        Log::shouldReceive('error')->once();
+
+        $listener = new ApplyBindingsOnFormSubmit($applicator);
+        $listener->handle(new FormSubmissionSubmitted($submission));
+
+        $reloaded = FormSubmission::query()->withoutGlobalScopes()->find($submission->id);
+        $this->assertSame('unknown_error', $reloaded->failure_response_code);
+    }
+
+    public function test_writes_temporary_error_when_deadline_exceeds(): void
+    {
+        // Per RFC-WS-6 §Q1 v1.3 addition 4 — wrapper throws Timeout, which
+        // extends FormBindingInfraException, so failure_response_code
+        // resolves to 'temporary_error' via the classifier.
+        $this->assertFailureResponseCode(
+            FormBindingApplicatorTimeoutException::class,
+            'temporary_error',
+        );
+    }
+
+    public function test_deadline_wrapper_is_invoked_with_config_value(): void
+    {
+        // Drive the applicator clone via a test double that asserts the
+        // deadline value reached withDeadline().
+        Config::set('form_builder.apply_deadline_seconds', 3);
+
+        $submission = $this->makeSubmission();
+        $applicator = new DeadlineRecordingApplicator(
+            $this->app->make(\App\FormBuilder\Purposes\PurposeRegistry::class),
+            $this->app->make(\App\FormBuilder\Bindings\BindingConflictResolver::class),
+            $this->app->make(\App\FormBuilder\Bindings\BindingTypeRegistry::class),
+            $this->app->make(\App\FormBuilder\Bindings\BindingActivityLogger::class),
+        );
+
+        $listener = new ApplyBindingsOnFormSubmit($applicator);
+        $listener->handle(new FormSubmissionSubmitted($submission));
+
+        $this->assertSame(3, DeadlineRecordingApplicator::$lastDeadline);
+    }
+
+    public function test_outer_transaction_writes_failure_record_on_inner_rollback(): void
+    {
+        $submission = $this->makeSubmission();
+        $applicator = $this->throwingApplicator(FormBindingSchemaConfigException::class, 'no schema');
+
+        Log::shouldReceive('error')->once();
+
+        $listener = new ApplyBindingsOnFormSubmit($applicator);
+        $listener->handle(new FormSubmissionSubmitted($submission));
+
+        $failure = FormSubmissionActionFailure::query()
+            ->where('form_submission_id', $submission->id)
+            ->first();
+
+        $this->assertNotNull($failure, 'Outer transaction must write the failure record even after the inner rollback');
+        $this->assertSame(FormBindingSchemaConfigException::class, $failure->exception_class);
+    }
+
     public function test_exception_path_records_failure_and_marks_failed(): void
     {
         $submission = $this->makeSubmission();
 
-        $applicator = $this->throwingApplicator();
+        $applicator = $this->throwingApplicator(\RuntimeException::class, 'boom');
 
         Log::shouldReceive('error')->once();
 
@@ -66,7 +189,7 @@ final class ApplyBindingsOnFormSubmitTest extends TestCase
     {
         $submission = $this->makeSubmission();
 
-        $applicator = $this->throwingApplicator();
+        $applicator = $this->throwingApplicator(\RuntimeException::class, 'boom');
 
         Log::shouldReceive('error')->once();
 
@@ -81,14 +204,33 @@ final class ApplyBindingsOnFormSubmitTest extends TestCase
         $this->assertFalse($threw, 'Listener must swallow throws so siblings keep running');
     }
 
-    private function throwingApplicator(): ThrowingApplicator
+    private function assertFailureResponseCode(string $exceptionClass, string $expectedCode): void
     {
-        return new ThrowingApplicator(
+        $submission = $this->makeSubmission();
+        $applicator = $this->throwingApplicator($exceptionClass, 'test');
+
+        Log::shouldReceive('error')->once();
+
+        $listener = new ApplyBindingsOnFormSubmit($applicator);
+        $listener->handle(new FormSubmissionSubmitted($submission));
+
+        $reloaded = FormSubmission::query()->withoutGlobalScopes()->find($submission->id);
+        $this->assertSame(ApplyStatus::FAILED, $reloaded->apply_status);
+        $this->assertSame($expectedCode, $reloaded->failure_response_code);
+    }
+
+    private function throwingApplicator(string $exceptionClass, string $message): ThrowingApplicator
+    {
+        $applicator = new ThrowingApplicator(
             $this->app->make(\App\FormBuilder\Purposes\PurposeRegistry::class),
             $this->app->make(\App\FormBuilder\Bindings\BindingConflictResolver::class),
             $this->app->make(\App\FormBuilder\Bindings\BindingTypeRegistry::class),
             $this->app->make(\App\FormBuilder\Bindings\BindingActivityLogger::class),
         );
+        $applicator->exceptionClass = $exceptionClass;
+        $applicator->message = $message;
+
+        return $applicator;
     }
 
     private function makeSubmission(): FormSubmission
@@ -156,7 +298,7 @@ final class ApplyBindingsOnFormSubmitTest extends TestCase
 
     private function writeValue(string $submissionId, string $fieldId, mixed $value): void
     {
-        $row = new FormValue();
+        $row = new FormValue;
         $row->form_submission_id = $submissionId;
         $row->form_field_id = $fieldId;
         $row->setAttribute('value', $value);
@@ -192,10 +334,53 @@ final class ApplyBindingsOnFormSubmitTest extends TestCase
     }
 }
 
+/**
+ * Test double — apply() throws an instance of the configured exception
+ * class. Subclass of FormBindingApplicator so withDeadline() (which
+ * returns clone $this) preserves the override.
+ */
 final class ThrowingApplicator extends FormBindingApplicator
 {
+    public string $exceptionClass = \RuntimeException::class;
+
+    public string $message = 'boom';
+
     public function apply(FormSubmission $submission, ?string $sectionId = null): BindingPassResult
     {
-        throw new \RuntimeException('boom');
+        $class = $this->exceptionClass;
+
+        // FormBindingApplicatorException subclasses use named-arg constructor;
+        // generic Throwables use the standard message ctor.
+        if (is_subclass_of($class, \App\Exceptions\FormBuilder\FormBindingApplicatorException::class)) {
+            throw new $class(submissionId: (string) $submission->id, message: $this->message);
+        }
+
+        throw new $class($this->message);
+    }
+}
+
+/**
+ * Test double — captures the deadline value passed via withDeadline().
+ * Used by test_deadline_wrapper_is_invoked_with_config_value.
+ */
+final class DeadlineRecordingApplicator extends FormBindingApplicator
+{
+    public static ?int $lastDeadline = null;
+
+    public function withDeadline(int $seconds): self
+    {
+        self::$lastDeadline = $seconds;
+
+        return $this;
+    }
+
+    public function apply(FormSubmission $submission, ?string $sectionId = null): BindingPassResult
+    {
+        return new BindingPassResult(
+            formSubmissionId: (string) $submission->id,
+            provisionedSubjectType: null,
+            provisionedSubjectId: null,
+            applications: [],
+        );
     }
 }
diff --git a/api/tests/Feature/FormBuilder/Listeners/FormSubmissionSubmittedListenerOrderTest.php b/api/tests/Feature/FormBuilder/Listeners/FormSubmissionSubmittedListenerOrderTest.php
index 68799002..8d52855f 100644
--- a/api/tests/Feature/FormBuilder/Listeners/FormSubmissionSubmittedListenerOrderTest.php
+++ b/api/tests/Feature/FormBuilder/Listeners/FormSubmissionSubmittedListenerOrderTest.php
@@ -10,12 +10,23 @@ use App\Listeners\FormBuilder\SyncTagPickerSelectionsOnSubmit;
 use App\Listeners\FormBuilder\TriggerPersonIdentityMatchOnFormSubmit;
 use Illuminate\Contracts\Queue\ShouldQueue;
 use Illuminate\Support\Facades\Event;
+use ReflectionClass;
 use Tests\TestCase;
 
 /**
- * RFC-WS-6 §3 (Q1) — listener order on FormSubmissionSubmitted is
- * load-bearing: ApplyBindings sync (1st) → IdentityMatch sync (2nd) →
- * queued siblings parallel.
+ * RFC-WS-6 v1.3 §Q1 — listener layout on FormSubmissionSubmitted is
+ * load-bearing.
+ *
+ * v1.3 layout: ApplyBindingsOnFormSubmit is the only sync listener;
+ * every other listener implements ShouldQueue and is gated on
+ * apply_status=COMPLETED per ARCH-BINDINGS §5.6.
+ *
+ * v1.0/v1.2 layout had two sync listeners (ApplyBindings then
+ * TriggerPersonIdentityMatch); the v1.3 review (2026-05-07) reduced the
+ * sync chain to one. The assertions below lock the v1.3 layout so
+ * a future contributor cannot silently revert TriggerPersonIdentityMatch
+ * to sync, or queue ApplyBindings, or omit the gating-invariant on a
+ * new queued listener.
  */
 final class FormSubmissionSubmittedListenerOrderTest extends TestCase
 {
@@ -41,28 +52,70 @@ final class FormSubmissionSubmittedListenerOrderTest extends TestCase
 
     public function test_apply_bindings_listener_is_synchronous(): void
     {
-        $reflection = new \ReflectionClass(ApplyBindingsOnFormSubmit::class);
+        $reflection = new ReflectionClass(ApplyBindingsOnFormSubmit::class);
         $this->assertFalse(
             $reflection->implementsInterface(ShouldQueue::class),
-            'ApplyBindingsOnFormSubmit must be sync (no ShouldQueue)',
+            'ApplyBindingsOnFormSubmit must be sync (no ShouldQueue) — subject_id must land in the HTTP response.',
         );
     }
 
-    public function test_identity_match_listener_is_synchronous(): void
+    public function test_identity_match_listener_is_queued(): void
     {
-        $reflection = new \ReflectionClass(TriggerPersonIdentityMatchOnFormSubmit::class);
-        $this->assertFalse(
+        // v1.3 flip — was sync in v1.0/v1.2. RFC-WS-6 §Q1 v1.3.
+        $reflection = new ReflectionClass(TriggerPersonIdentityMatchOnFormSubmit::class);
+        $this->assertTrue(
             $reflection->implementsInterface(ShouldQueue::class),
-            'TriggerPersonIdentityMatchOnFormSubmit must be sync (no ShouldQueue)',
+            'TriggerPersonIdentityMatchOnFormSubmit must be queued (ShouldQueue) per RFC-WS-6 v1.3 §Q1.',
         );
     }
 
     public function test_tag_picker_sync_listener_is_queued(): void
     {
-        $reflection = new \ReflectionClass(SyncTagPickerSelectionsOnSubmit::class);
+        $reflection = new ReflectionClass(SyncTagPickerSelectionsOnSubmit::class);
         $this->assertTrue(
             $reflection->implementsInterface(ShouldQueue::class),
             'SyncTagPickerSelectionsOnSubmit must be queued (ShouldQueue)',
         );
     }
+
+    /**
+     * Structural guard: every queued listener attached to
+     * FormSubmissionSubmitted must include the apply_status=COMPLETED
+     * gate as an early statement of handle().
+     *
+     * Implementation: file-content scan rather than full AST parsing —
+     * good enough as a regression guard, deliberately fragile if someone
+     * tries to be clever (e.g. comparing via a helper method). Keep the
+     * guard simple and let it fail loudly when the canonical pattern
+     * drifts; rewrite both the listener and this test together if you
+     * deliberately change the pattern.
+     */
+    public function test_every_queued_listener_has_apply_status_completed_gate(): void
+    {
+        $listeners = Event::getRawListeners()[FormSubmissionSubmitted::class] ?? [];
+        $listenerClasses = array_values(array_filter(array_map(
+            static fn ($listener): ?string => is_string($listener) ? $listener : null,
+            $listeners,
+        )));
+
+        foreach ($listenerClasses as $class) {
+            $reflection = new ReflectionClass($class);
+            if (! $reflection->implementsInterface(ShouldQueue::class)) {
+                continue;
+            }
+
+            $source = file_get_contents($reflection->getFileName());
+
+            $this->assertStringContainsString(
+                'apply_status !== ApplyStatus::COMPLETED',
+                (string) $source,
+                "Queued listener {$class} must include the apply_status=COMPLETED gating-invariant per ARCH-BINDINGS §5.6.",
+            );
+            $this->assertStringContainsString(
+                'form-builder.queued-listener.skipped_apply_failed',
+                (string) $source,
+                "Queued listener {$class} must log the canonical skip event for triage visibility.",
+            );
+        }
+    }
 }
diff --git a/api/tests/Feature/FormBuilder/Listeners/SyncTagPickerSelectionsOnSubmitGateTest.php b/api/tests/Feature/FormBuilder/Listeners/SyncTagPickerSelectionsOnSubmitGateTest.php
new file mode 100644
index 00000000..263b461c
--- /dev/null
+++ b/api/tests/Feature/FormBuilder/Listeners/SyncTagPickerSelectionsOnSubmitGateTest.php
@@ -0,0 +1,147 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature\FormBuilder\Listeners;
+
+use App\Enums\FormBuilder\ApplyStatus;
+use App\Enums\FormBuilder\FormPurpose;
+use App\Enums\FormBuilder\FormSubmissionStatus;
+use App\Events\FormBuilder\FormSubmissionSubmitted;
+use App\Listeners\FormBuilder\SyncTagPickerSelectionsOnSubmit;
+use App\Models\CrowdType;
+use App\Models\Event;
+use App\Models\FormBuilder\FormSchema;
+use App\Models\FormBuilder\FormSubmission;
+use App\Models\Organisation;
+use App\Models\Person;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Log;
+use Mockery;
+use Tests\TestCase;
+
+/**
+ * Per ARCH-BINDINGS §5.6 v1.2 — the gating-invariant first statement on
+ * every queued listener attached to FormSubmissionSubmitted skips when
+ * apply_status !== COMPLETED. PARTIAL and FAILED both fall through.
+ *
+ * Verified by asserting the canonical skip-log line
+ * (form-builder.queued-listener.skipped_apply_failed) IS emitted on
+ * apply_status of NULL/PENDING/PARTIAL/FAILED, and is NOT emitted when
+ * apply_status is COMPLETED. FormTagSyncService is `final` so we can't
+ * spy on it directly; the log line is the canonical observable signal.
+ */
+final class SyncTagPickerSelectionsOnSubmitGateTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private Organisation $org;
+
+    private Event $event;
+
+    private CrowdType $crowdType;
+
+    private FormSchema $schema;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->org = Organisation::factory()->create();
+        $this->event = Event::factory()->create(['organisation_id' => $this->org->id]);
+        $this->crowdType = CrowdType::factory()->systemType('CREW')->create([
+            'organisation_id' => $this->org->id,
+        ]);
+        $this->schema = FormSchema::factory()->create([
+            'organisation_id' => $this->org->id,
+            'purpose' => FormPurpose::EVENT_REGISTRATION,
+            'owner_type' => 'event',
+            'owner_id' => $this->event->id,
+        ]);
+    }
+
+    private function makeSubmission(?ApplyStatus $applyStatus): FormSubmission
+    {
+        $person = Person::factory()->create([
+            'event_id' => $this->event->id,
+            'crowd_type_id' => $this->crowdType->id,
+        ]);
+
+        $submission = FormSubmission::create([
+            'form_schema_id' => $this->schema->id,
+            'subject_type' => 'person',
+            'subject_id' => $person->id,
+            'status' => FormSubmissionStatus::SUBMITTED->value,
+            'submitted_at' => now(),
+            'is_test' => false,
+        ]);
+
+        if ($applyStatus !== null) {
+            $submission->apply_status = $applyStatus;
+            $submission->save();
+        }
+
+        return $submission->fresh();
+    }
+
+    private function dispatchListener(FormSubmission $submission): void
+    {
+        $listener = $this->app->make(SyncTagPickerSelectionsOnSubmit::class);
+        $listener->handle(new FormSubmissionSubmitted($submission));
+    }
+
+    private function assertSkipLogged(?ApplyStatus $applyStatus): void
+    {
+        // Spy on Log so we can pick out the canonical skip-log line
+        // without strict-mocking other Log calls (siblings may log too).
+        $logSpy = Log::spy();
+
+        $submission = $this->makeSubmission($applyStatus);
+        $this->dispatchListener($submission);
+
+        $logSpy->shouldHaveReceived(
+            'info',
+            [
+                'form-builder.queued-listener.skipped_apply_failed',
+                Mockery::on(static fn (array $context): bool => ($context['listener'] ?? null) === SyncTagPickerSelectionsOnSubmit::class),
+            ],
+        );
+    }
+
+    public function test_skips_when_apply_status_is_null(): void
+    {
+        $this->assertSkipLogged(null);
+    }
+
+    public function test_skips_when_apply_status_is_pending(): void
+    {
+        $this->assertSkipLogged(ApplyStatus::PENDING);
+    }
+
+    public function test_skips_when_apply_status_is_partial(): void
+    {
+        // PARTIAL is treated identically to FAILED per ARCH-BINDINGS §5.6.
+        $this->assertSkipLogged(ApplyStatus::PARTIAL);
+    }
+
+    public function test_skips_when_apply_status_is_failed(): void
+    {
+        $this->assertSkipLogged(ApplyStatus::FAILED);
+    }
+
+    public function test_does_not_log_skip_when_apply_status_is_completed(): void
+    {
+        // When the gate passes, the canonical skip-log line must NOT
+        // fire. Other Log calls (e.g. tag-sync.deferred when person.user_id
+        // is null) may still fire and are out of scope here.
+        $logSpy = Log::spy();
+
+        $submission = $this->makeSubmission(ApplyStatus::COMPLETED);
+        $this->dispatchListener($submission);
+
+        $logSpy->shouldNotHaveReceived('info', [
+            'form-builder.queued-listener.skipped_apply_failed',
+            Mockery::any(),
+        ]);
+    }
+}
diff --git a/api/tests/Feature/FormBuilder/Listeners/TriggerPersonIdentityMatchOnFormSubmitTest.php b/api/tests/Feature/FormBuilder/Listeners/TriggerPersonIdentityMatchOnFormSubmitTest.php
index 5123834a..f995f988 100644
--- a/api/tests/Feature/FormBuilder/Listeners/TriggerPersonIdentityMatchOnFormSubmitTest.php
+++ b/api/tests/Feature/FormBuilder/Listeners/TriggerPersonIdentityMatchOnFormSubmitTest.php
@@ -4,13 +4,15 @@ declare(strict_types=1);
 
 namespace Tests\Feature\FormBuilder\Listeners;
 
-use App\Enums\FormBuilder\FormFieldType;
+use App\Enums\FormBuilder\ApplyStatus;
 use App\Enums\FormBuilder\FormPurpose;
 use App\Enums\FormBuilder\FormSubmissionStatus;
+use App\Events\FormBuilder\FormSubmissionIdentityMatchResolved;
 use App\Events\FormBuilder\FormSubmissionSubmitted;
+use App\Exceptions\FormBuilder\IdentityMatchInvariantViolation;
+use App\Listeners\FormBuilder\TriggerPersonIdentityMatchOnFormSubmit;
 use App\Models\CrowdType;
 use App\Models\Event;
-use App\Models\FormBuilder\FormField;
 use App\Models\FormBuilder\FormSchema;
 use App\Models\FormBuilder\FormSubmission;
 use App\Models\Organisation;
@@ -18,20 +20,20 @@ use App\Models\Person;
 use App\Models\User;
 use Database\Seeders\RoleSeeder;
 use Illuminate\Foundation\Testing\RefreshDatabase;
-use Illuminate\Support\Facades\Config;
-use Illuminate\Support\Str;
+use Illuminate\Support\Facades\Broadcast;
 use Tests\TestCase;
 
 /**
- * Contract tests for TriggerPersonIdentityMatchOnFormSubmit. The listener
- * acts as the FORM-05 stub + first-cut match detector per ARCH §31.1 and
- * drives the form_submissions.identity_match_status column for the portal
- * banner. These tests lock in the transition matrix so follow-up work
- * extending PersonIdentityService can't silently break the contract.
+ * Contract tests for TriggerPersonIdentityMatchOnFormSubmit (v1.3 layout).
  *
- * NOTE: PersonIdentityService is final, so we drive state via real
- * Person/User fixtures (deterministic outcomes of detectMatches) rather
- * than mocking.
+ * v1.3 changes:
+ *   - Listener is now queued (was sync in v1.0/v1.2).
+ *   - Failsafe-pad ("subject_id null → write 'pending' + log warning")
+ *     replaced with strict invariant: throws IdentityMatchInvariantViolation
+ *     when subject_type='person' AND subject_id IS NULL AND apply_status=COMPLETED.
+ *   - Gate as first statement: skip when apply_status !== COMPLETED.
+ *   - Dispatches FormSubmissionIdentityMatchResolved on the
+ *     submission.{id} private channel after writing the final status.
  */
 final class TriggerPersonIdentityMatchOnFormSubmitTest extends TestCase
 {
@@ -64,10 +66,24 @@ final class TriggerPersonIdentityMatchOnFormSubmitTest extends TestCase
     }
 
     /**
+     * Build a submission then directly invoke the listener so the test
+     * fixture controls apply_status without going through ApplyBindings.
+     *
+     * `apply_status` is intentionally not in $fillable on the model
+     * (production writes go through ApplyBindings, never mass-assign);
+     * tests pass it via $overrides and we route it through direct
+     * attribute assignment.
+     *
      * @param  array<string, mixed>  $overrides
      */
-    private function submit(array $overrides = []): FormSubmission
+    private function makeSubmission(array $overrides = []): FormSubmission
     {
+        $applyStatus = null;
+        if (array_key_exists('apply_status', $overrides)) {
+            $applyStatus = $overrides['apply_status'];
+            unset($overrides['apply_status']);
+        }
+
         $submission = FormSubmission::create(array_merge([
             'form_schema_id' => $this->schema->id,
             'subject_type' => null,
@@ -77,30 +93,76 @@ final class TriggerPersonIdentityMatchOnFormSubmitTest extends TestCase
             'is_test' => false,
         ], $overrides));
 
-        FormSubmissionSubmitted::dispatch($submission->fresh());
+        if ($applyStatus !== null) {
+            $submission->apply_status = $applyStatus;
+            $submission->save();
+        }
 
         return $submission->fresh();
     }
 
-    public function test_public_event_registration_submission_is_marked_pending(): void
+    private function dispatchListener(FormSubmission $submission): void
     {
-        // RFC Q2: this path is now a logged-warning failsafe. The pending
-        // state is preserved for portal banner rendering, but a misconfigured
-        // schema or silently-failed ApplyBindings should surface in logs.
-        // Spy mode (not strict mock) so other listeners' Log calls don't
-        // interfere — ApplyBindingsOnFormSubmit may also log error here.
-        $logSpy = \Illuminate\Support\Facades\Log::spy();
+        $listener = $this->app->make(TriggerPersonIdentityMatchOnFormSubmit::class);
+        $listener->handle(new FormSubmissionSubmitted($submission));
+    }
 
-        $submission = $this->submit();
+    public function test_handle_skips_when_apply_status_is_not_completed(): void
+    {
+        // v1.3 §Q2 + ARCH-BINDINGS §5.6 — gate skips on null/PENDING/PARTIAL/FAILED.
+        $person = Person::factory()->create([
+            'event_id' => $this->event->id,
+            'crowd_type_id' => $this->crowdType->id,
+            'user_id' => null,
+            'email' => 'gate-skip@example.test',
+        ]);
 
-        $this->assertSame('pending', $submission->identity_match_status);
+        $submission = $this->makeSubmission([
+            'subject_type' => 'person',
+            'subject_id' => $person->id,
+            // apply_status is NULL — gate must skip.
+        ]);
 
-        /** @var \Mockery\Expectation $expectation */
-        $expectation = $logSpy->shouldHaveReceived('warning');
-        $expectation->with(
-            'form-builder.identity-match.no_person_subject_post_apply',
-            \Mockery::type('array'),
-        );
+        $this->dispatchListener($submission);
+
+        // identity_match_status stays NULL because the listener returned at the gate.
+        $this->assertNull($submission->fresh()->identity_match_status);
+    }
+
+    public function test_handle_skips_when_apply_status_is_partial(): void
+    {
+        // PARTIAL is treated identically to FAILED by the gate per ARCH-BINDINGS §5.6.
+        $person = Person::factory()->create([
+            'event_id' => $this->event->id,
+            'crowd_type_id' => $this->crowdType->id,
+            'user_id' => null,
+        ]);
+
+        $submission = $this->makeSubmission([
+            'subject_type' => 'person',
+            'subject_id' => $person->id,
+            'apply_status' => ApplyStatus::PARTIAL->value,
+        ]);
+
+        $this->dispatchListener($submission);
+
+        // PARTIAL → gate skips → identity_match_status untouched.
+        $this->assertNull($submission->fresh()->identity_match_status);
+    }
+
+    public function test_handle_throws_invariant_violation_when_subject_id_null_after_completed_with_person_subject_type(): void
+    {
+        // v1.3 §Q2 — strict invariant replaces the v1.2 failsafe-pad.
+        $submission = $this->makeSubmission([
+            'subject_type' => 'person',
+            'subject_id' => null,                 // invariant violation
+            'apply_status' => ApplyStatus::COMPLETED->value,
+        ]);
+
+        $this->expectException(IdentityMatchInvariantViolation::class);
+        $this->expectExceptionMessageMatches('/subject_id=null after ApplyBindings COMPLETED/');
+
+        $this->dispatchListener($submission);
     }
 
     public function test_linked_person_is_marked_matched(): void
@@ -112,12 +174,15 @@ final class TriggerPersonIdentityMatchOnFormSubmitTest extends TestCase
             'user_id' => $user->id,
         ]);
 
-        $submission = $this->submit([
+        $submission = $this->makeSubmission([
             'subject_type' => 'person',
             'subject_id' => $person->id,
+            'apply_status' => ApplyStatus::COMPLETED->value,
         ]);
 
-        $this->assertSame('matched', $submission->identity_match_status);
+        $this->dispatchListener($submission);
+
+        $this->assertSame('matched', $submission->fresh()->identity_match_status);
     }
 
     public function test_unlinked_person_with_no_matches_is_marked_none(): void
@@ -134,12 +199,15 @@ final class TriggerPersonIdentityMatchOnFormSubmitTest extends TestCase
             'registration_source' => 'self',
         ]);
 
-        $submission = $this->submit([
+        $submission = $this->makeSubmission([
             'subject_type' => 'person',
             'subject_id' => $person->id,
+            'apply_status' => ApplyStatus::COMPLETED->value,
         ]);
 
-        $this->assertSame('none', $submission->identity_match_status);
+        $this->dispatchListener($submission);
+
+        $this->assertSame('none', $submission->fresh()->identity_match_status);
     }
 
     public function test_unlinked_person_with_pending_match_is_marked_pending(): void
@@ -156,12 +224,15 @@ final class TriggerPersonIdentityMatchOnFormSubmitTest extends TestCase
             'email' => 'match@example.test',
         ]);
 
-        $submission = $this->submit([
+        $submission = $this->makeSubmission([
             'subject_type' => 'person',
             'subject_id' => $person->id,
+            'apply_status' => ApplyStatus::COMPLETED->value,
         ]);
 
-        $this->assertSame('pending', $submission->identity_match_status);
+        $this->dispatchListener($submission);
+
+        $this->assertSame('pending', $submission->fresh()->identity_match_status);
     }
 
     public function test_non_event_registration_submission_is_left_untouched(): void
@@ -180,75 +251,63 @@ final class TriggerPersonIdentityMatchOnFormSubmitTest extends TestCase
             'status' => FormSubmissionStatus::SUBMITTED->value,
             'submitted_at' => now(),
             'is_test' => false,
+            'apply_status' => ApplyStatus::COMPLETED->value,
         ]);
 
-        FormSubmissionSubmitted::dispatch($submission->fresh());
+        $this->dispatchListener($submission->fresh());
 
         $this->assertNull($submission->fresh()->identity_match_status);
     }
 
-    public function test_it_writes_identity_match_status_before_http_response_returns(): void
-    {
-        // Regression guard: the listener must run synchronously so the
-        // public submit response already carries identity_match.status.
-        // If someone reinstates ShouldQueue, the column stays null in
-        // the response body (only written later by a queue worker) and
-        // this assertion fails.
-        Config::set('form_builder.captcha.required_for_purposes', []);
-
-        $this->schema->update([
-            'is_published' => true,
-            'public_token' => (string) Str::ulid(),
-        ]);
-        FormField::factory()->create([
-            'form_schema_id' => $this->schema->id,
-            'field_type' => FormFieldType::TEXT->value,
-            'slug' => 'motivatie',
-            'label' => 'Motivatie',
-            'is_portal_visible' => true,
-            'is_admin_only' => false,
-        ]);
-        $token = $this->schema->fresh()->public_token;
-
-        $create = $this->postJson(
-            "/api/v1/public/forms/{$token}/submissions",
-            [
-                'idempotency_key' => 'sync-regression-001',
-                'public_submitter_name' => 'Sync Tester',
-                'public_submitter_email' => 'sync-tester@example.test',
-            ],
-        );
-        $create->assertCreated();
-        $submissionId = $create->json('data.id');
-
-        $this->postJson(
-            "/api/v1/public/forms/{$token}/submissions/{$submissionId}/submit",
-            ['values' => ['motivatie' => 'test']],
-        )
-            ->assertCreated()
-            ->assertJsonPath('data.status', 'submitted')
-            ->assertJsonPath('data.identity_match.status', 'pending');
-    }
-
     public function test_submission_with_no_schema_is_left_untouched(): void
     {
         // Guard branch: if the schema relation can't resolve, the listener
         // must early-return without touching the status and without throwing
         // (so sibling listeners keep executing).
-        $submission = FormSubmission::create([
-            'form_schema_id' => $this->schema->id,
+        $submission = $this->makeSubmission([
             'subject_type' => null,
             'subject_id' => null,
-            'status' => FormSubmissionStatus::SUBMITTED->value,
-            'submitted_at' => now(),
-            'is_test' => false,
+            'apply_status' => ApplyStatus::COMPLETED->value,
         ]);
 
         // Soft-delete the schema so fresh(['schema']) returns null for the relation.
         FormSchema::query()->whereKey($this->schema->id)->delete();
 
-        FormSubmissionSubmitted::dispatch($submission->fresh());
+        $this->dispatchListener($submission);
 
         $this->assertNull($submission->fresh()->identity_match_status);
     }
+
+    public function test_dispatches_broadcast_after_successful_match(): void
+    {
+        // broadcast(...) helper returns a PendingBroadcast which on
+        // __destruct calls Event::dispatch($event). Faking the Event
+        // facade for our specific event class captures the dispatch
+        // without it leaving the test boundary.
+        \Illuminate\Support\Facades\Event::fake([FormSubmissionIdentityMatchResolved::class]);
+
+        $user = User::factory()->create();
+        $person = Person::factory()->create([
+            'event_id' => $this->event->id,
+            'crowd_type_id' => $this->crowdType->id,
+            'user_id' => $user->id,
+        ]);
+
+        $submission = $this->makeSubmission([
+            'subject_type' => 'person',
+            'subject_id' => $person->id,
+            'apply_status' => ApplyStatus::COMPLETED->value,
+        ]);
+
+        $this->dispatchListener($submission);
+
+        \Illuminate\Support\Facades\Event::assertDispatched(
+            FormSubmissionIdentityMatchResolved::class,
+            function (FormSubmissionIdentityMatchResolved $event) use ($submission): bool {
+                return $event->submissionId === (string) $submission->id
+                    && $event->status === 'matched'
+                    && $event->matchCount >= 0;
+            },
+        );
+    }
 }
diff --git a/dev-docs/BACKLOG.md b/dev-docs/BACKLOG.md
index 00506071..526fa9df 100644
--- a/dev-docs/BACKLOG.md
+++ b/dev-docs/BACKLOG.md
@@ -1003,6 +1003,22 @@ ARCH-discussie en RFC.
 
 ---
 
+### TECH-CHANNEL-AUTH-ORG-ADMIN — Extend `submission.{id}` private channel auth to organisation admins
+
+**Aanleiding:** WS-6 v1.3-delta D2 wires the broadcast event `FormSubmissionIdentityMatchResolved` (RFC-WS-6 §Q1 v1.3 addition 2) on the `submission.{id}` private channel. The auth callback in `routes/channels.php` currently authorises only the submitter (`submitted_by_user_id === user.id`). Org-admin access was deferred because the codebase does not yet have a vetted Spatie Permission helper for organisation-scoped role checks (e.g. `hasRoleInOrganisation('organizer_admin', $orgId)`); guessing the API would risk authorising too broadly or too narrowly without test coverage. Phase A audit confirmed no precedent for this check pattern in `app/`.
+
+**Wat:**
+- Audit Spatie Permission usage across the codebase to identify (or design) the canonical "is X a role-holder in organisation Y" helper. Likely candidates: extension method on `User`, query scope on `Organisation::users()` pivot, or a dedicated Policy method.
+- Extend `routes/channels.php`'s `submission.{submissionId}` callback to additionally authorise organisation admins of the submission's organisation. Replace the inline TODO with the resolved helper.
+- Add channel authorization tests covering the four cases: submitter (allow), org admin (allow), other org user (deny), anonymous (deny).
+- Update RFC-WS-6 §Q1 v1.3 addition 2 reference if the auth contract changes shape; otherwise leave RFC alone.
+
+**Prioriteit:** Medium — frontend Echo subscription is also out of WS-6 scope, so the channel has no live subscribers yet. When the frontend follow-up ships, org admins are expected to see live updates on submissions in their orgs — that is when this work blocks the user-facing feature.
+
+**Refs:** `api/routes/channels.php` (TODO marker in submission channel callback), RFC-WS-6 §Q1 v1.3 addition 2, ARCH-BINDINGS §11 (admin failures UI — analogous tenant scope via FK chain).
+
+---
+
 ### ~~TECH-02 — scopeForFestival helper op Event model~~ ✅ OPGELOST
 
 ---