docs(02-02): complete edge cases and API documentation plan

Tasks completed: 3/3
- Add edge case tests (10 new tests)
- Create API documentation for Phase 4
- Run full test suite (22 constraint tests pass)

SUMMARY: .planning/phases/02-constraint-validation/02-02-SUMMARY.md

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/phases/02-constraint-validation/02-02-SUMMARY.md

@@ -0,0 +1,107 @@
+---
+phase: 02-constraint-validation
+plan: 02
+subsystem: testing
+tags: [swift-testing, constraints, edge-cases, api-docs]
+
+# Dependency graph
+requires:
+  - phase: 02-01
+    provides: migrated constraint tests to Swift Testing
+provides:
+  - 22 comprehensive constraint tests including edge cases
+  - API documentation for Phase 4 drag-drop integration
+affects: [04-drag-interaction]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - Edge case test naming convention (edge_*)
+    - Success criteria verification tests (success_*)
+
+key-files:
+  created:
+    - ".planning/phases/02-constraint-validation/CONSTRAINT-API.md"
+  modified:
+    - "SportsTimeTests/Domain/ItineraryConstraintsTests.swift"
+
+key-decisions:
+  - "Tests use Swift Testing to match existing project patterns"
+  - "Edge case tests cover boundaries: day 0, beyond trip, exact sortOrder, negative/large values"
+
+patterns-established:
+  - "Success criteria verification: tests named 'success_*' directly verify ROADMAP success criteria"
+  - "Edge case testing: boundary conditions explicitly tested for constraint validation"
+
+# Metrics
+duration: 23min
+completed: 2026-01-18
+---
+
+# Phase 2 Plan 02: Edge Cases and API Documentation Summary
+
+**22 constraint tests with edge case coverage, plus complete API documentation for Phase 4 drag-drop integration**
+
+## Performance
+
+- **Duration:** 23 min
+- **Started:** 2026-01-18T20:50:49Z
+- **Completed:** 2026-01-18T21:13:45Z
+- **Tasks:** 3
+- **Files modified:** 2
+
+## Accomplishments
+- Added 10 edge case tests covering boundary conditions (single-day trips, day 0, beyond trip, exact sortOrder boundaries, negative/large sortOrders)
+- Added 3 success criteria verification tests matching ROADMAP requirements
+- Created comprehensive API documentation for Phase 4 drag-drop integration
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Add edge case tests** - `1320a34` (test)
+2. **Task 2: Create API documentation** - `73ed315` (docs)
+3. **Task 3: Run full test suite** - No commit (verification only)
+
+## Files Created/Modified
+- `SportsTimeTests/Domain/ItineraryConstraintsTests.swift` - Added 10 edge case tests + 3 success criteria tests (now 22 total)
+- `.planning/phases/02-constraint-validation/CONSTRAINT-API.md` - API reference for Phase 4
+
+## Decisions Made
+- Used Swift Testing framework (matching Phase 1 patterns)
+- Edge case tests cover all boundary conditions: day boundaries (0, beyond trip), sortOrder boundaries (exact, negative, large), and trip edge cases (single-day, no games)
+- Success criteria tests directly verify ROADMAP success criteria for CONS-01 through CONS-04
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 3 - Blocking] Old XCTest file still existed**
+- **Found during:** Task 1 (Add edge case tests)
+- **Issue:** Plan 02-01 migrated tests to Swift Testing but didn't delete old XCTest file, causing "filename used twice" build error
+- **Fix:** Removed orphaned XCTest file; all tests now in Domain/ItineraryConstraintsTests.swift
+- **Files affected:** SportsTimeTests/ItineraryConstraintsTests.swift (removed)
+- **Verification:** Build succeeds, all 22 tests pass
+- **Committed in:** 1320a34 (Task 1 commit includes correct file)
+
+---
+
+**Total deviations:** 1 auto-fixed (1 blocking)
+**Impact on plan:** Blocking issue resolved; no scope creep.
+
+## Issues Encountered
+None - plan executed as specified after resolving blocking issue.
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Phase 2 complete: All constraint validation tests passing (22 tests)
+- API documentation ready for Phase 4 (CONSTRAINT-API.md)
+- Requirements CONS-01 through CONS-04 verified by tests
+- Ready for Phase 3 (Visual Flattening) or can proceed directly to Phase 4
+
+---
+*Phase: 02-constraint-validation*
+*Completed: 2026-01-18*