S2c D5 completion: schema_version_at_open column + drift semantics. - Migration 2026_04_22_100002 adds unsignedInteger schema_version_at_open. Recorded by FormSubmissionService::createDraft at the moment the portal first renders the form. - PublicFormSubmissionResource.schema_drift now compares schema_version_at_open vs schema_version_at_submit (or schema.version for active drafts) so organiser edits during an open draft surface as drift on subsequent PUT/submit responses. - PublicFormSubmissionController::update routes through FormSubmissionService::saveDraft so auto_save_count increments and the FormSubmissionDraftUpdated event fires per PUT. - bootstrap/app.php: FormRequest ValidationException on /api/v1/public/forms/* is now re-wrapped into the D6 envelope with code=VALIDATION_FAILED, so public endpoints emit one consistent error shape regardless of layer. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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