semi implemented and features implemented save checkpoint

docs/features/unchecked/scanner/triage-lanes.md

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+# Triage lanes (visibility buckets: ACTIVE, BLOCKED, MUTED_REACH, MUTED_VEX, etc.)
+
+## Module
+Scanner
+
+## Status
+IMPLEMENTED
+
+## Description
+Triage lane toggle and quiet lane components implement visibility buckets for findings. Scanner Triage module provides the backend data model.
+
+## Implementation Details
+- **Triage Lane Enums**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Triage/Entities/TriageEnums.cs` - Triage lane definitions including ACTIVE, BLOCKED, MUTED_REACH, MUTED_VEX, and other visibility buckets
+- **Triage Finding Model**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Triage/Entities/TriageFinding.cs` - `TriageFinding` entity with lane assignment for visibility bucketing
+- **Triage Status Service**:
+  - `src/Scanner/StellaOps.Scanner.WebService/Services/TriageStatusService.cs` - `TriageStatusService` managing lane transitions and visibility state
+- **Gating Integration**:
+  - `src/Scanner/StellaOps.Scanner.WebService/Services/FindingRationaleService.cs` - `FindingRationaleService` providing rationale for lane assignments
+  - `src/Scanner/StellaOps.Scanner.WebService/Contracts/RationaleContracts.cs` - Contracts for lane rationale
+
+## E2E Test Plan
+- [ ] Assign a finding to the ACTIVE lane and verify it appears in the active findings list
+- [ ] Move a finding to MUTED_REACH lane (unreachable vulnerability) and verify it is filtered from the active view
+- [ ] Move a finding to MUTED_VEX lane (VEX not_affected) and verify it is muted with VEX justification
+- [ ] Toggle a finding between lanes and verify the transition history is preserved
+- [ ] Verify BLOCKED lane findings are visible but marked as requiring action
+- [ ] Verify lane assignments are reflected in the triage API response with correct rationale