Spec 120: harden secret redaction integrity (#146)
## Summary
- replace broad substring-based masking with a shared exact/path-based secret classifier and workspace-scoped fingerprint hashing
- persist protected snapshot metadata on `policy_versions` and keep secret-only changes visible in compare, drift, restore, review, verification, and ops surfaces
- add Spec 120 artifacts, audit documentation, and focused Pest regression coverage for snapshot, audit, verification, review-pack, and notification behavior
## Validation
- `vendor/bin/sail artisan test --compact tests/Feature/Intune/PolicySnapshotRedactionTest.php tests/Feature/Intune/PolicySnapshotFingerprintIsolationTest.php tests/Feature/ReviewPack/ReviewPackRedactionIntegrityTest.php tests/Feature/OpsUx/OperationRunNotificationRedactionTest.php tests/Feature/Verification/VerificationReportViewerDbOnlyTest.php`
- `vendor/bin/sail bin pint --dirty --format agent`
## Spec / checklist status
| Checklist | Total | Completed | Incomplete | Status |
|-----------|-------|-----------|------------|--------|
| requirements.md | 16 | 16 | 0 | ✓ PASS |
- `tasks.md`: T001-T032 complete
- `tasks.md`: T033 manual quickstart validation is still open and noted for follow-up
## Filament / platform notes
- Livewire v4 compliance is unchanged
- no panel provider changes; `bootstrap/providers.php` remains the registration location
- no new globally searchable resources were introduced, so global search requirements are unchanged
- no new destructive Filament actions were added
- no new Filament assets were added; no `filament:assets` deployment change is required
## Testing coverage touched
- snapshot persistence and fingerprint isolation
- compare/drift protected-change evidence
- audit, verification, review-pack, ops-failure, and notification sanitization
- viewer/read-only Filament presentation updates
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #146
ahmido
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