docs(01-05): complete server mode plan

Tasks completed: 2/2
- HTTP server with health endpoint and PID file
- Graceful shutdown with signal handlers

SUMMARY: .planning/phases/01-core-infrastructure/01-05-SUMMARY.md

Phase 1 (Core Infrastructure) complete.

.planning/ROADMAP.md

@@ -14,7 +14,7 @@ None
 - Integer phases (1, 2, 3): Planned milestone work
 - Decimal phases (2.1, 2.2): Urgent insertions (marked with INSERTED)
 
-- [ ] **Phase 1: Core Infrastructure** - CLI binary, server mode, process lifecycle, graceful shutdown
+- [x] **Phase 1: Core Infrastructure** - CLI binary, server mode, process lifecycle, graceful shutdown
 - [ ] **Phase 2: Data Layer** - SQLite database with task hierarchy schema
 - [ ] **Phase 3: Git Integration** - Worktree isolation per agent with proper lifecycle
 - [ ] **Phase 4: Agent Lifecycle** - Spawn, stop, list agents with session persistence
@@ -36,7 +36,7 @@ Plans:
 - [x] 01-02: CLI Entry Point (Wave 2)
 - [x] 01-03: Process Management (Wave 2)
 - [x] 01-04: Logging Infrastructure (Wave 2)
-- [ ] 01-05: Coordination Server & Shutdown (Wave 3)
+- [x] 01-05: Coordination Server & Shutdown (Wave 3)
 
 ### Phase 2: Data Layer
 **Goal**: SQLite database with Drizzle ORM, task hierarchy schema (initiative → phase → plan → task)
@@ -112,7 +112,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7
 
 | Phase | Plans Complete | Status | Completed |
 |-------|----------------|--------|-----------|
-| 1. Core Infrastructure | 4/5 | In progress | - |
+| 1. Core Infrastructure | 5/5 | Complete | 2026-01-30 |
 | 2. Data Layer | 0/? | Not started | - |
 | 3. Git Integration | 0/? | Not started | - |
 | 4. Agent Lifecycle | 0/? | Not started | - |

.planning/STATE.md

@@ -10,27 +10,27 @@ See: .planning/PROJECT.md (updated 2026-01-30)
 ## Current Position
 
 Phase: 1 of 7 (Core Infrastructure)
-Plan: 4 of 5 in current phase
-Status: In progress
-Last activity: 2026-01-30 — Completed 01-04-PLAN.md
+Plan: 5 of 5 in current phase
+Status: Phase complete
+Last activity: 2026-01-30 — Completed 01-05-PLAN.md
 
-Progress: ████████░░ 57%
+Progress: ██████████ 71%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 4
-- Average duration: 2 min
-- Total execution time: 8 min
+- Total plans completed: 5
+- Average duration: 3 min
+- Total execution time: 15 min
 
 **By Phase:**
 
 | Phase | Plans | Total | Avg/Plan |
 |-------|-------|-------|----------|
-| 1 | 4/5 | 8 min | 2 min |
+| 1 | 5/5 | 15 min | 3 min |
 
 **Recent Trend:**
-- Last 5 plans: 01-01 (2 min), 01-02 (1 min), 01-03 (0 min), 01-04 (5 min)
+- Last 5 plans: 01-01 (2 min), 01-02 (1 min), 01-03 (0 min), 01-04 (5 min), 01-05 (7 min)
 - Trend: Steady
 
 ## Accumulated Context
@@ -43,6 +43,7 @@ Recent decisions affecting current work:
 - 01-01: Merged Tasks 1 and 2 since build verification required source files
 - 01-02: Task 2 required no code changes - existing bin config was correct
 - 01-04: Log directory structure ~/.cw/logs/{processId}/ with timestamp prefixes
+- 01-05: Used node:http instead of Express for minimal server footprint
 
 ### Pending Todos
 
@@ -55,5 +56,5 @@ None yet.
 ## Session Continuity
 
 Last session: 2026-01-30
-Stopped at: Completed 01-04-PLAN.md
+Stopped at: Completed 01-05-PLAN.md (Phase 1 complete)
 Resume file: None

.planning/phases/01-core-infrastructure/01-05-SUMMARY.md

@@ -0,0 +1,126 @@
+---
+phase: 01-core-infrastructure
+plan: 05
+subsystem: infra
+tags: [http, server, graceful-shutdown, pid-file, coordination]
+
+# Dependency graph
+requires:
+  - phase: 01-02
+    provides: CLI entry point with Commander
+  - phase: 01-03
+    provides: ProcessManager and ProcessRegistry for process lifecycle
+  - phase: 01-04
+    provides: LogManager for logging infrastructure
+provides:
+  - CoordinationServer class with HTTP health endpoint
+  - GracefulShutdown handler for SIGTERM/SIGINT/SIGHUP
+  - PID file management to prevent duplicate servers
+  - Server mode via cw --server flag
+affects: [02-agent-lifecycle, 04-orchestration, monitoring]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - "Native node:http server (no Express for minimal footprint)"
+    - "PID file locking pattern for singleton server"
+    - "Signal handler orchestration with timeout"
+
+key-files:
+  created:
+    - src/server/types.ts
+    - src/server/index.ts
+    - src/server/shutdown.ts
+  modified:
+    - src/cli/index.ts
+    - src/bin/cw.ts
+
+key-decisions:
+  - "Used node:http instead of Express for minimal dependencies"
+  - "10-second shutdown timeout before force exit"
+  - "Double SIGINT forces immediate exit for stuck situations"
+  - "PID file at ~/.cw/server.pid with stale detection"
+
+patterns-established:
+  - "Server module structure: types.ts, index.ts (main class), shutdown.ts"
+  - "Health endpoint pattern: GET /health returns {status, uptime, processCount}"
+  - "Signal handling: install() method registers handlers after server starts"
+
+# Metrics
+duration: 7min
+completed: 2026-01-30
+---
+
+# Phase 1 Plan 05: Server Mode Summary
+
+**HTTP coordination server with health endpoint, PID file management, and graceful shutdown via SIGTERM/SIGINT/SIGHUP**
+
+## Performance
+
+- **Duration:** 7 min
+- **Started:** 2026-01-30T12:19:21Z
+- **Completed:** 2026-01-30T12:27:05Z
+- **Tasks:** 2
+- **Files created:** 3
+- **Files modified:** 2
+
+## Accomplishments
+
+- CoordinationServer class using native node:http (no Express dependency)
+- GET /health endpoint returning status, uptime, and processCount
+- GET /status endpoint returning server state and process list
+- PID file management with stale PID detection
+- GracefulShutdown class handling SIGTERM, SIGINT, SIGHUP
+- 10-second timeout before force exit
+- Double SIGINT for immediate force exit
+- CLI --server flag and --port option integration
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create HTTP server with health endpoint and PID file** - `bec46aa` (feat)
+2. **Task 2: Implement graceful shutdown** - `59b2337` (feat)
+
+**Plan metadata:** (this commit)
+
+## Files Created/Modified
+
+- `src/server/types.ts` - ServerConfig, ServerState, HealthResponse, StatusResponse types
+- `src/server/index.ts` - CoordinationServer class with HTTP routes and PID file management
+- `src/server/shutdown.ts` - GracefulShutdown class with signal handlers
+- `src/cli/index.ts` - Added --server flag handling and startServer function
+- `src/bin/cw.ts` - Updated to use async runCli()
+
+## Decisions Made
+
+| Decision | Rationale |
+|----------|-----------|
+| node:http over Express | Minimal dependencies, server only needs 2 routes |
+| 10-second shutdown timeout | Industry standard, enough time for graceful cleanup |
+| PID file at ~/.cw/server.pid | Follows Unix conventions, easy to check/remove manually |
+| Stale PID detection | Handles crashes gracefully by checking if PID is alive |
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+- Server infrastructure complete, satisfies INFRA-04 (graceful shutdown)
+- Health endpoint enables monitoring and readiness checks
+- Foundation ready for agent coordination in Phase 4
+- Server mode is the entry point for the coordination layer
+
+---
+*Phase: 01-core-infrastructure*
+*Completed: 2026-01-30*