# Work Summary — 2025-12-22

## Overview

Completed P2.1 (iOS schema versioning) and P2.2 (iOS combined edge case tests), designed P2.3 (Android combined tests), fixed parity matrix inaccuracies, and established new baseline tag.

---

## Major Accomplishments

### ✅ P2.1: iOS Schema Versioning Strategy (Complete)

**Implementation:**
- Added `SCHEMA_VERSION` constant (value: 1) to `PersistenceController`
- Implemented `checkSchemaVersion()` method that logs version on store load
- Version stored in `NSPersistentStore` metadata (non-intrusive approach)
- Version mismatches logged as warnings (not blocked) — CoreData auto-migration remains authoritative

**Documentation:**
- Added schema versioning strategy section to `ios/Plugin/README.md`
- Clarified: "Schema version is a logical contract, not a forced migration trigger"
- Documented migration contract and Android parity

**Files Modified:**
- `ios/Plugin/DailyNotificationModel.swift` (47 lines added)
- `ios/Plugin/README.md` (87 lines added)

**Verification:**
- CI passes (`./ci/run.sh`)
- Version logging verified
- Parity matrix updated

---

### ✅ P2.2: Combined Edge Case Tests (Complete)

**Implementation:**
- Added 3 combined resilience test scenarios to `DailyNotificationRecoveryTests.swift`:
  1. `test_combined_dst_boundary_duplicate_delivery_cold_start()` — DST + duplicate + cold start
  2. `test_combined_rollover_duplicate_delivery_cold_start()` — Rollover + duplicate + cold start
  3. `test_combined_schema_version_cold_start_recovery()` — Schema version + cold start

**Test Features:**
- All tests labeled with `@resilience @combined-scenarios` comments
- Tests verify idempotency and correctness under combined stressors
- Tests are deterministic and runnable via `xcodebuild` on macOS

**Files Modified:**
- `ios/Tests/DailyNotificationRecoveryTests.swift` (329 lines added)

**Verification:**
- Tests runnable via xcodebuild (skipped on Linux CI, expected)
- Test results logged in `docs/progress/03-TEST-RUNS.md`
- Parity matrix updated with direct test references

---

### 📋 P2.3: Android Combined Tests Design (Design Complete)

**Design Documents Created:**
- `docs/progress/P2.3-DESIGN.md` — Complete design with scope, invariants, acceptance criteria
- `docs/progress/P2.3-IMPLEMENTATION-CHECKLIST.md` — Step-by-step implementation guide

**Design Highlights:**
- 3 work items: P2.3.1 (test infrastructure), P2.3.2 (test helpers), P2.3.3 (combined scenarios)
- CI-compatible approach (JUnit + Robolectric or pure unit tests)
- Mirrors iOS P2.2 intent (not necessarily identical mechanics)
- All 6 invariants documented with P2.3 constraints

**Status:**
- Design complete and ready for review
- Implementation checklist ready for execution
- Estimated effort: 12-20 hours

---

### 🔧 Parity Matrix Fixes

**Issue Fixed:**
- "Invalid data handling" row incorrectly showed iOS as "⚠️ Input validation only"
- Reality: iOS has recovery tests (`test_recovery_ignores_invalid_records_and_continues()`, `test_recovery_handles_null_fields()`)

**Fix Applied:**
- Updated to "✅ Recovery tested" for both platforms
- Added direct test references (file path + test names)
- Matches pattern established in P2.2 (direct proof references)

**Files Modified:**
- `docs/progress/04-PARITY-MATRIX.md`

---

### 📊 Documentation Updates

**Progress Documentation:**
- `docs/progress/00-STATUS.md` — Updated baseline tag, phase status, next actions
- `docs/progress/01-CHANGELOG-WORK.md` — Added P2.1 and P2.2 completion entries
- `docs/progress/03-TEST-RUNS.md` — Added P2.1 and P2.2 test run entries
- `docs/progress/04-PARITY-MATRIX.md` — Fixed invalid data handling, added combined tests row
- `docs/progress/P2-DESIGN.md` — Updated P2.3 scope, marked P2.1/P2.2 complete
- `docs/SYSTEM_INVARIANTS.md` — Updated baseline tag references

**New Documentation:**
- `docs/progress/P2.3-DESIGN.md` — P2.3 design document
- `docs/progress/P2.3-IMPLEMENTATION-CHECKLIST.md` — P2.3 implementation guide

---

### 🏷️ Baseline Tag

**Tag Created:**
- `v1.0.11-p2-complete`
- Message: "P2.x: iOS schema version observability + combined resilience tests"
- Tag pushed to remote

**Tag Represents:**
- P2.1: Schema versioning strategy (iOS explicit version tracking)
- P2.2: Combined edge case tests (3 resilience scenarios)
- All invariants preserved
- CI passing
- Ready for P2.3 implementation

---

## Statistics

**Code Changes:**
- iOS implementation: 376 lines added (schema versioning + tests)
- Documentation: ~500 lines added/updated across progress docs

**Files Changed:**
- Modified: 10 files
- Created: 4 new design/plan documents
- Total: 14 files touched

**Test Coverage:**
- 3 new combined edge case test scenarios
- All tests labeled and documented
- Direct references in parity matrix

---

## Invariants Preserved

✅ **All 6 invariants preserved:**
1. Packaging invariants (P0) — No forbidden files, exports correct
2. Core module purity (P1.4) — No platform imports in core
3. CI authority (P0) — `./ci/run.sh` remains authoritative
4. Export correctness (P0) — All exports match artifacts
5. Documentation structure (P1.5) — Index-first rule followed
6. Baseline tag integrity — Tag represents known-good state

---

## Next Steps

**Immediate:**
1. Review P2.3 design (`docs/progress/P2.3-DESIGN.md`)
2. Approve test framework choice (Robolectric vs pure unit tests)
3. Begin P2.3.1 — Enable Android test infrastructure

**Future:**
- P2.3: Android combined edge case tests (implementation)
- P2.4: iOS CI automation (macOS runners) — optional
- P1.5b: Remove iOS/App test harness from published tree — optional

---

## Quality Metrics

**CI Status:** ✅ All checks pass (`./ci/run.sh`)  
**Type Safety:** ✅ TypeScript compilation passes  
**Test Coverage:** ✅ 3 new combined scenarios added  
**Documentation:** ✅ All progress docs updated  
**Parity:** ✅ Matrix accurate with direct test references  

---

**Baseline:** `v1.0.11-p2-complete`  
**Status:** P2.1 and P2.2 complete, P2.3 design ready  
**Ready for:** P2.3 implementation