# 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)

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### 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`

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## 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

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## 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