feat(form-builder): retry history table + integration (WS-6)

Per-attempt retry history (timestamp, user, outcome, exception detail
if failed) replaces the counter-only retry_count tracking.

Changes:

- New `form_submission_action_failure_retry_attempts` table (cascade on
  parent delete, nullOnDelete on user). Explicit short FK names
  (`fsafra_failure_fk`, `fsafra_user_fk`) — auto-generated names exceed
  MySQL's 64-char identifier limit.
- New FormSubmissionActionFailureRetryAttempt model + factory +
  succeeded() state.
- Parent FormSubmissionActionFailure gets retryAttempts() HasMany
  relation (latest('attempted_at')).
- New FormFailureRetryService centralises the retry-flow logic. Both
  the API controller and the artisan command delegate to it. Service
  writes a retry_attempt record per attempt; parent's retry_count
  stays as denormalised cache for index-view performance.
- Successful retry: attempt(succeeded) + parent.retry_count++ +
  parent.resolved_at + parent.resolved_by_user_id + parent.resolved_note
  ("Geslaagde retry door {actor.name}" or "Geslaagde retry
  (geautomatiseerd)" for command-line invocation without an actor).
- Failed retry: attempt(failed) with NEW exception details +
  parent.retry_count++. Parent's exception_class/_message stay
  audit-immutable — they represent the FIRST failure.
- canBeRetried() now correctly checks both resolved_at AND
  dismissed_at (sessie 2's open question Q2 closure).
- New FailureNotRetriableException (controller → 422) and
  ParentSubmissionGoneException (controller → 410) for cleaner
  flow control.

12 new tests:
- FormSubmissionActionFailureRetryAttemptTest (5 unit tests)
- RetryFlowProducesRetryAttemptsTest (7 integration tests covering
  succeeded path, failed path, resolved/dismissed blocking,
  multiple-retries chronological ordering, canBeRetried truth tables)

Pre-existing tests touched:
- FormSubmissionActionFailureTest::test_can_be_retried_only_for_open_state
  — updated to reflect Q2 closure (resolved now blocks too).
- Ws6FoundationMigrationTest::test_down_methods_clean_up_columns_and_table
  — child table must drop before parent (FK constraint).
- 5 backfill test step-counts bumped +1 (new migration sits at top).

SCHEMA.md → v2.9. Schema dump regenerated.

Refs: RFC-WS-6.md §3 Q5 addendum, sessie 2 Q2

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

api/database/factories/FormBuilder/FormSubmissionActionFailureRetryAttemptFactory.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Database\Factories\FormBuilder;
+
+use App\Exceptions\FormBuilder\PersonProvisioningException;
+use App\Models\FormBuilder\FormSubmissionActionFailure;
+use App\Models\FormBuilder\FormSubmissionActionFailureRetryAttempt;
+use App\Models\User;
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+/** @extends Factory<FormSubmissionActionFailureRetryAttempt> */
+final class FormSubmissionActionFailureRetryAttemptFactory extends Factory
+{
+    protected $model = FormSubmissionActionFailureRetryAttempt::class;
+
+    /** @return array<model-property<FormSubmissionActionFailureRetryAttempt>, mixed> */
+    public function definition(): array
+    {
+        return [
+            'form_submission_action_failure_id' => FormSubmissionActionFailure::factory(),
+            'attempted_at' => fake()->dateTimeBetween('-7 days', 'now'),
+            'attempted_by_user_id' => User::factory(),
+            'outcome' => 'failed',
+            'exception_class' => PersonProvisioningException::class,
+            'exception_message' => 'Person provisioning failed: no_default_crowd_type',
+        ];
+    }
+
+    public function succeeded(): static
+    {
+        return $this->state(fn (): array => [
+            'outcome' => 'succeeded',
+            'exception_class' => null,
+            'exception_message' => null,
+        ]);
+    }
+}