docs: define milestone v1.3 requirements

6 requirements across 2 categories:
- UNIT-01 through UNIT-03: Jest unit tests
- INT-01 through INT-03: Playwright integration tests

.planning/REQUIREMENTS.md

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+# Requirements: Session Settings Tests
+
+**Defined:** 2026-02-07
+**Core Value:** Enable confident changes to Session Settings modal through comprehensive test coverage
+
+## v1.3 Requirements
+
+Requirements for Session Settings test coverage. Critical paths only.
+
+### Unit Tests (Jest)
+
+- [ ] **UNIT-01**: Modal renders correctly with currentSession props (privacy, description)
+- [ ] **UNIT-02**: Save button calls onSave with correct payload (privacy number, description)
+- [ ] **UNIT-03**: Loading state disables form interactions (save button, inputs)
+
+### Integration Tests (Playwright)
+
+- [ ] **INT-01**: Settings button in session toolbar opens modal
+- [ ] **INT-02**: Save settings makes PUT /sessions/{id} API call with correct data
+- [ ] **INT-03**: Cancel closes modal without making API call
+
+## Out of Scope
+
+| Feature | Reason |
+|---------|--------|
+| Exhaustive state change tests | Core paths only, not every input change |
+| Privacy transform unit tests | Covered implicitly by save payload test |
+| Error handling tests | Deferred to keep scope minimal |
+| Success toast tests | Deferred to keep scope minimal |
+| Visual regression tests | Not part of this milestone |
+| Other modal tests | Only JKSessionSettingsModal |
+
+## Traceability
+
+| Requirement | Phase | Status |
+|-------------|-------|--------|
+| UNIT-01 | Phase 17 | Pending |
+| UNIT-02 | Phase 17 | Pending |
+| UNIT-03 | Phase 17 | Pending |
+| INT-01 | Phase 18 | Pending |
+| INT-02 | Phase 18 | Pending |
+| INT-03 | Phase 18 | Pending |
+
+**Coverage:**
+- v1.3 requirements: 6 total
+- Mapped to phases: 6
+- Unmapped: 0 ✓
+
+---
+*Requirements defined: 2026-02-07*
+*Last updated: 2026-02-07 after initial definition*