Spec 322: add browser no-drift regression guards (#379)
## Summary
- add the Spec 322 artifact set for the browser no-drift regression guard
- add Feature navigation guards for admin surface scope, environment CTA URLs, and legacy alias rejection
- add Browser smoke coverage for workspace hubs, environment-owned surfaces, workspace-owned analysis surfaces, and alerts/audit flows
- add the Spec 322 browser support harness used by the new smoke coverage
## Validation
- `cd apps/platform && ./vendor/bin/sail artisan test tests/Feature/Navigation/Spec322AdminSurfaceScopeContractTest.php tests/Feature/Navigation/Spec322LegacyQueryAliasGuardTest.php tests/Feature/Navigation/Spec322EnvironmentCtaUrlContractTest.php --compact`
- `cd apps/platform && ./vendor/bin/sail artisan test tests/Browser/Spec322WorkspaceHubNoDriftSmokeTest.php tests/Browser/Spec322EnvironmentOwnedSurfaceSmokeTest.php tests/Browser/Spec322WorkspaceOwnedAnalysisSmokeTest.php tests/Browser/Spec322AlertsAuditNoDriftSmokeTest.php --compact`
- `cd apps/platform && ./vendor/bin/sail pint --dirty`
- `git diff --check`
## Notes
- a broader filtered regression run still reports existing Baseline Compare feature-test failures outside this diff
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #379
ahmido
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