docs(18-02): create plan summary and update project state

Add 18-02-SUMMARY.md with task commits, decisions, and metrics.
Update STATE.md position to plan 2 of 4 in phase 18.

.planning/STATE.md

@@ -203,6 +203,9 @@ Recent decisions affecting current work:
 - 17-04: Route param is $id matching existing $id.tsx file route definition
 - 18-01: Reuse SerializedInitiative shape for header props (dates as ISO strings)
 - 18-01: Actions button disabled as placeholder — wired in Plan 04
+- 18-02: SerializedTask type defined in TaskRow (same Date-to-string serialization pattern as SerializedInitiative)
+- 18-02: Phase hierarchy flattened — Plan layer hidden per decision 15-02, tasks rendered directly under phase
+- 18-02: Underscore prefix for unused type prop in DependencyIndicator (_type) to satisfy noUnusedParameters
 
 ### Pending Todos
 
@@ -225,5 +228,5 @@ None.
 ## Session Continuity
 
 Last session: 2026-02-04
-Stopped at: Completed 18-01-PLAN.md
+Stopped at: Completed 18-02-PLAN.md
 Resume file: None

.planning/phases/18-initiative-detail/18-02-SUMMARY.md

@@ -0,0 +1,97 @@
+---
+phase: 18-initiative-detail
+plan: 02
+subsystem: ui
+tags: [react, tailwind, lucide-react, tree-view]
+
+# Dependency graph
+requires:
+  - phase: 17-initiative-dashboard
+    provides: StatusBadge component
+  - plan: 18-01
+    provides: component patterns, SerializedInitiative type
+provides:
+  - DependencyIndicator component for blocked-by annotations
+  - TaskRow component with tree connectors and status
+  - PhaseAccordion expandable phase container with task list
+affects: [18-04 page assembly, initiative detail page]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [tree-view with Unicode connectors, accordion with useState]
+
+key-files:
+  created:
+    - packages/web/src/components/DependencyIndicator.tsx
+    - packages/web/src/components/TaskRow.tsx
+    - packages/web/src/components/PhaseAccordion.tsx
+  modified: []
+
+key-decisions:
+  - "18-02: SerializedTask type defined in TaskRow (same Date-to-string serialization pattern as SerializedInitiative)"
+  - "18-02: Phase hierarchy flattened — Plan layer hidden per decision 15-02, tasks rendered directly under phase"
+  - "18-02: Underscore prefix for unused type prop in DependencyIndicator (_type) to satisfy noUnusedParameters"
+
+patterns-established:
+  - "Tree connector pattern: Unicode ├── / └── with border-l for visual continuity"
+  - "Accordion pattern: useState toggle with ChevronDown/ChevronRight icons"
+
+# Metrics
+duration: 4min
+completed: 2026-02-04
+---
+
+# Phase 18 Plan 02: PhaseAccordion, TaskRow & DependencyIndicator Summary
+
+**Three interconnected components for the initiative detail hierarchy view: expandable phase containers, task rows with tree connectors, and dependency annotations**
+
+## Performance
+
+- **Duration:** 4 min
+- **Started:** 2026-02-04
+- **Completed:** 2026-02-04
+- **Tasks:** 3
+- **Files modified:** 3
+
+## Accomplishments
+- DependencyIndicator: pure presentational component rendering `^ blocked by: name1, name2` in amber text, returns null when empty
+- TaskRow: task row with Unicode tree connectors (├── / └──), StatusBadge, inline agent name in blue, DependencyIndicator for blocked tasks, clickable with hover feedback
+- PhaseAccordion: expandable/collapsible phase container with ChevronDown/ChevronRight toggle, phase number + name header, task count (completed/total), StatusBadge, phase-level DependencyIndicator, and TaskRow list when expanded
+- All components are presentational — data assembly handled by parent page
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create DependencyIndicator component** - `a00b7b5` (feat)
+2. **Task 2: Create TaskRow component** - `4becfe8` (feat)
+3. **Task 3: Create PhaseAccordion component** - `92d4d36` (feat)
+
+## Files Created/Modified
+- `packages/web/src/components/DependencyIndicator.tsx` - Blocked-by annotation with ^ prefix in amber text
+- `packages/web/src/components/TaskRow.tsx` - Task row with tree connectors, status badge, agent name, dependency indicator
+- `packages/web/src/components/PhaseAccordion.tsx` - Expandable phase container with chevron toggle, task count, status, task list
+
+## Decisions Made
+- 18-02: SerializedTask type defined in TaskRow (same Date-to-string serialization pattern as SerializedInitiative)
+- 18-02: Phase hierarchy flattened — Plan layer hidden per decision 15-02, tasks rendered directly under phase
+- 18-02: Underscore prefix for unused type prop in DependencyIndicator (_type) to satisfy noUnusedParameters
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- All three components ready for page assembly in Plan 04
+- Ready for 18-03-PLAN.md (DecisionList and remaining detail components)
+
+---
+*Phase: 18-initiative-detail*
+*Completed: 2026-02-04*