feat: harden queued execution legitimacy (#179)
## Summary
- add a canonical queued execution legitimacy contract for actor-bound and system-authority operation runs
- enforce legitimacy before queued jobs transition runs to running across provider, inventory, restore, bulk, sync, and scheduled backup flows
- surface blocked execution outcomes consistently in Monitoring, notifications, audit data, and the tenantless operation viewer
- add Spec 149 artifacts and focused Pest coverage for legitimacy decisions, middleware ordering, blocked presentation, retry behavior, and cross-family adoption
## Testing
- vendor/bin/sail artisan test --compact tests/Unit/Operations/QueuedExecutionLegitimacyGateTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Operations/QueuedExecutionMiddlewareOrderingTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Verification/ProviderExecutionReauthorizationTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Operations/RunInventorySyncExecutionReauthorizationTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Operations/ExecuteRestoreRunExecutionReauthorizationTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Operations/SystemRunBlockedExecutionNotificationTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Operations/BulkOperationExecutionReauthorizationTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Operations/QueuedExecutionRetryReauthorizationTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Operations/QueuedExecutionContractMatrixTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Operations/OperationRunBlockedExecutionPresentationTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Operations/QueuedExecutionAuditTrailTest.php
- vendor/bin/sail artisan test --compact tests/Feature/Operations/TenantlessOperationRunViewerTest.php
- vendor/bin/sail bin pint --dirty --format agent
## Manual validation
- validated queued provider execution blocking for tenant operability drift in the integrated browser on /admin/operations and /admin/operations/{run}
- validated 404 vs 403 route behavior for non-membership vs in-scope capability denial
- validated initiator-null blocked system-run behavior without creating a user terminal notification
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #179
ahmido
5bcb4f6ab8