feat(form-builder): add FormSubmissionActionFailurePolicy with FK-chain auth (WS-6)

Tenant scope verified via failure.submission.organisation_id, NOT route
binding. Cross-tenant access returns false (controllers in sessions 2/3
will translate to 404 to prevent enumeration). Five abilities:
viewAny, view, retry, resolve, dismiss.

Laravel 12 auto-discovers App\Policies\FormBuilder\FormSubmissionActionFailurePolicy
for App\Models\FormBuilder\FormSubmissionActionFailure — no explicit
registration needed (pattern matches the existing FormSubmissionPolicy).

IDOR-class security tests included with explicit RFC V3 cross-reference
in the test class docblock.

Refs: RFC-WS-6.md §4 (V3), ARCH-FORM-BUILDER.md §22.9

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

api/app/Policies/FormBuilder/FormSubmissionActionFailurePolicy.php

@@ -0,0 +1,84 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Policies\FormBuilder;
+
+use App\Models\FormBuilder\FormSubmissionActionFailure;
+use App\Models\Organisation;
+use App\Models\User;
+
+/**
+ * RFC-WS-6 §4 (V3) — IDOR-class FK-chain enforcement.
+ *
+ * The `form_submission_action_failures` table has no `organisation_id`
+ * column by design. Tenant scope flows via
+ * failure.submission.organisation_id. Cross-tenant access returns
+ * `false` here; controllers (sessions 2/3) translate to 404 to prevent
+ * resource-existence enumeration.
+ */
+final class FormSubmissionActionFailurePolicy
+{
+    public function viewAny(User $user): bool
+    {
+        if ($user->hasRole('super_admin')) {
+            return true;
+        }
+
+        // Org admin in any organisation. Controllers in sessions 2/3
+        // restrict the result set per role.
+        return $user->organisations()
+            ->wherePivot('role', 'org_admin')
+            ->exists();
+    }
+
+    public function view(User $user, FormSubmissionActionFailure $failure): bool
+    {
+        return $this->canAccess($user, $failure);
+    }
+
+    public function retry(User $user, FormSubmissionActionFailure $failure): bool
+    {
+        return $this->canAccess($user, $failure);
+    }
+
+    public function resolve(User $user, FormSubmissionActionFailure $failure): bool
+    {
+        return $this->canAccess($user, $failure);
+    }
+
+    public function dismiss(User $user, FormSubmissionActionFailure $failure): bool
+    {
+        return $this->canAccess($user, $failure);
+    }
+
+    private function canAccess(User $user, FormSubmissionActionFailure $failure): bool
+    {
+        $failure->loadMissing('submission');
+        $submission = $failure->submission;
+        if ($submission === null) {
+            return false; // parent submission deleted
+        }
+
+        $orgId = (string) $submission->organisation_id;
+        if ($orgId === '') {
+            return false;
+        }
+
+        if ($user->hasRole('super_admin')) {
+            return true;
+        }
+
+        // Tenant scope: user must be an org_admin in the failure's
+        // organisation. RFC V3 — IDOR-class FK-chain enforcement.
+        $organisation = $submission->organisation;
+        if (! $organisation instanceof Organisation) {
+            return false;
+        }
+
+        return $organisation->users()
+            ->where('user_id', $user->id)
+            ->wherePivot('role', 'org_admin')
+            ->exists();
+    }
+}

api/tests/Unit/Policies/FormBuilder/FormSubmissionActionFailurePolicyTest.php

@@ -0,0 +1,142 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Policies\FormBuilder;
+
+use App\Models\FormBuilder\FormSchema;
+use App\Models\FormBuilder\FormSubmission;
+use App\Models\FormBuilder\FormSubmissionActionFailure;
+use App\Models\Organisation;
+use App\Models\User;
+use App\Policies\FormBuilder\FormSubmissionActionFailurePolicy;
+use Database\Seeders\RoleSeeder;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Tests\TestCase;
+
+/**
+ * RFC V3 — IDOR-class FK-chain enforcement.
+ *
+ * The cross-tenant test below is the IDOR-class assertion: an admin
+ * from organisation B must not be able to access a failure whose
+ * submission belongs to organisation A. Findable in audit by the
+ * "IDOR" search term in this docblock.
+ */
+final class FormSubmissionActionFailurePolicyTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private Organisation $orgA;
+
+    private Organisation $orgB;
+
+    private User $superAdmin;
+
+    private User $orgAdminA;
+
+    private User $orgAdminB;
+
+    private User $regular;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->seed(RoleSeeder::class);
+
+        $this->orgA = Organisation::factory()->create();
+        $this->orgB = Organisation::factory()->create();
+
+        $this->superAdmin = User::factory()->create();
+        $this->superAdmin->assignRole('super_admin');
+
+        $this->orgAdminA = User::factory()->create();
+        $this->orgA->users()->attach($this->orgAdminA, ['role' => 'org_admin']);
+
+        $this->orgAdminB = User::factory()->create();
+        $this->orgB->users()->attach($this->orgAdminB, ['role' => 'org_admin']);
+
+        $this->regular = User::factory()->create();
+    }
+
+    public function test_super_admin_can_perform_all_abilities(): void
+    {
+        $failure = $this->failureFor($this->orgA);
+
+        $this->assertTrue($this->policy()->view($this->superAdmin, $failure));
+        $this->assertTrue($this->policy()->retry($this->superAdmin, $failure));
+        $this->assertTrue($this->policy()->resolve($this->superAdmin, $failure));
+        $this->assertTrue($this->policy()->dismiss($this->superAdmin, $failure));
+    }
+
+    public function test_org_admin_in_correct_org_can_perform_all_abilities(): void
+    {
+        $failure = $this->failureFor($this->orgA);
+
+        $this->assertTrue($this->policy()->view($this->orgAdminA, $failure));
+        $this->assertTrue($this->policy()->retry($this->orgAdminA, $failure));
+        $this->assertTrue($this->policy()->resolve($this->orgAdminA, $failure));
+        $this->assertTrue($this->policy()->dismiss($this->orgAdminA, $failure));
+    }
+
+    /**
+     * IDOR — RFC V3. An org admin in B must NOT see a failure in A.
+     */
+    public function test_org_admin_of_other_org_cannot_access_cross_tenant(): void
+    {
+        $failure = $this->failureFor($this->orgA);
+
+        $this->assertFalse($this->policy()->view($this->orgAdminB, $failure));
+        $this->assertFalse($this->policy()->retry($this->orgAdminB, $failure));
+        $this->assertFalse($this->policy()->resolve($this->orgAdminB, $failure));
+        $this->assertFalse($this->policy()->dismiss($this->orgAdminB, $failure));
+    }
+
+    public function test_regular_user_without_admin_role_denied_all(): void
+    {
+        $failure = $this->failureFor($this->orgA);
+
+        $this->assertFalse($this->policy()->view($this->regular, $failure));
+        $this->assertFalse($this->policy()->retry($this->regular, $failure));
+        $this->assertFalse($this->policy()->resolve($this->regular, $failure));
+        $this->assertFalse($this->policy()->dismiss($this->regular, $failure));
+    }
+
+    public function test_view_any_super_admin_yes_org_admin_yes_regular_no(): void
+    {
+        $this->assertTrue($this->policy()->viewAny($this->superAdmin));
+        $this->assertTrue($this->policy()->viewAny($this->orgAdminA));
+        $this->assertFalse($this->policy()->viewAny($this->regular));
+    }
+
+    public function test_view_returns_false_when_parent_submission_soft_deleted(): void
+    {
+        $failure = $this->failureFor($this->orgA);
+        // Soft-delete the submission. The failure row is preserved (no
+        // cascade on soft-delete); the policy's submission relation
+        // honours the SoftDeletes scope and returns null.
+        FormSubmission::query()->withoutGlobalScopes()->where('id', $failure->form_submission_id)->delete();
+
+        $reloaded = FormSubmissionActionFailure::query()->find($failure->id);
+        $this->assertNotNull($reloaded);
+
+        $this->assertFalse($this->policy()->view($this->superAdmin, $reloaded));
+    }
+
+    private function policy(): FormSubmissionActionFailurePolicy
+    {
+        return new FormSubmissionActionFailurePolicy();
+    }
+
+    private function failureFor(Organisation $organisation): FormSubmissionActionFailure
+    {
+        $schema = FormSchema::factory()->create(['organisation_id' => $organisation->id]);
+        $submission = FormSubmission::factory()->create([
+            'form_schema_id' => $schema->id,
+            'organisation_id' => $organisation->id,
+        ]);
+
+        return FormSubmissionActionFailure::factory()
+            ->for($submission, 'submission')
+            ->create();
+    }
+}