Spec 186: implement tenant registry recovery triage (#217)
## Summary
- turn the tenant registry into a workspace-scoped recovery triage surface with backup posture and recovery evidence columns
- preserve workspace overview backup and recovery drilldown intent by routing multi-tenant cases into filtered tenant registry slices
- add the Spec 186 planning artifacts, focused regression coverage, and shared triage presentation helpers
## Testing
- `cd apps/platform && ./vendor/bin/sail bin pint --dirty --format agent`
- `cd apps/platform && ./vendor/bin/sail artisan test --compact tests/Feature/Filament/TenantRegistryRecoveryTriageTest.php tests/Feature/Filament/WorkspaceOverviewSummaryMetricsTest.php tests/Feature/Filament/WorkspaceOverviewDrilldownContinuityTest.php tests/Feature/Filament/TenantResourceIndexIsWorkspaceScopedTest.php tests/Feature/Filament/WorkspaceOverviewAuthorizationTest.php tests/Feature/Guards/ActionSurfaceContractTest.php tests/Feature/Guards/FilamentTableStandardsGuardTest.php`
## Notes
- no schema change
- no new persisted recovery truth
- branch includes the full Spec 186 spec, plan, research, data model, contract, quickstart, and tasks artifacts
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #217
ahmido
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