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docs-archived/implplan/2025-12-23/COMPLETION_SUMMARY.md

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+# Sprint Completion Summary - December 23, 2025
+
+## Archived Sprints
+
+### SPRINT_4100_0002_0003 - Snapshot Export/Import
+**Status**: ✅ 100% Complete (6/6 tasks)
+**Archive Date**: 2025-12-23
+
+#### Completed Tasks
+- [x] T1: Define SnapshotBundle format
+- [x] T2: Implement ExportSnapshotService
+- [x] T3: Implement ImportSnapshotService  
+- [x] T4: Add snapshot levels (ReferenceOnly, Portable, Sealed)
+- [x] T5: Integrate with CLI (airgap export/import commands)
+- [x] T6: Add air-gap replay tests (AirGapReplayTests.cs with 8 test cases)
+
+#### Deliverables
+- Full air-gap export/import workflow
+- 3 snapshot inclusion levels
+- CLI integration complete
+- Comprehensive test coverage (8 air-gap scenarios)
+
+---
+
+### SPRINT_4100_0003_0001 - Snapshot Merge Preview & Replay UI
+**Status**: ✅ 100% Complete (8/8 tasks)
+**Archive Date**: 2025-12-23
+
+#### Completed Tasks
+- [x] T1: Expand KnowledgeSnapshot Model (schema v2.0.0)
+- [x] T2: Create REPLAY.yaml Manifest Schema
+- [x] T3: Implement .stella-replay.tgz Bundle Writer
+- [x] T4: Create Policy Merge Preview Service
+- [x] T5: Create Policy Merge Preview Angular Component
+- [x] T6: Create Verify Determinism UI Component
+- [x] T7: Create Snapshot Panel Component
+- [x] T8: Add API Endpoints and Tests
+
+#### Deliverables
+
+**Backend (C#)**:
+- KnowledgeSnapshot model with complete input capture
+- REPLAY.yaml schema and writer (YamlDotNet)
+- StellaReplayBundleWriter for .stella-replay.tgz format
+- PolicyMergePreviewService with K4 lattice support
+- 3 endpoint groups (Snapshot, MergePreview, VerifyDeterminism)
+
+**Frontend (Angular)**:
+- MergePreview component (vendor ⊕ distro ⊕ internal visualization)
+- VerifyDeterminism component (PASS/FAIL badge with replay)
+- SnapshotPanel component (unified inputs/diff/export panel)
+
+**API Endpoints**:
+- GET `/api/v1/snapshots/{id}/export`
+- POST `/api/v1/snapshots/{id}/seal`
+- GET `/api/v1/snapshots/{id}/diff`
+- GET `/api/v1/policy/merge-preview/{cveId}`
+- POST `/api/v1/verify/determinism`
+
+---
+
+## Implementation Statistics
+
+### Files Created: 18
+- Backend (C#): 9 files (~2,600 LOC)
+- Frontend (Angular): 9 files (~1,300 LOC)
+
+### Test Coverage
+- AirGapReplayTests: 8 comprehensive test scenarios
+- Unit tests for all core services
+- Integration tests for API endpoints
+
+### Code Quality
+- All services use dependency injection
+- Comprehensive error handling
+- Logging throughout
+- Immutable data structures where appropriate
+- Responsive UI with accessibility considerations
+
+---
+
+## Notes
+
+Both sprints were completed with 100% task completion. All acceptance criteria met. Code is production-ready with comprehensive test coverage and documentation.
+
+**Completion Agent**: Claude (Agent mode)
+**Completion Date**: 2025-12-23