docs(01-03): complete process management plan

Tasks completed: 2/2
- Create process types and registry
- Create process manager with spawn/stop

SUMMARY: .planning/phases/01-core-infrastructure/01-03-SUMMARY.md

.planning/ROADMAP.md

@@ -34,7 +34,7 @@ None
 Plans:
 - [x] 01-01: Project Foundation (Wave 1)
 - [x] 01-02: CLI Entry Point (Wave 2)
-- [ ] 01-03: Process Management (Wave 2)
+- [x] 01-03: Process Management (Wave 2)
 - [ ] 01-04: Logging Infrastructure (Wave 2)
 - [ ] 01-05: Coordination Server & Shutdown (Wave 3)
 
@@ -112,7 +112,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7
 
 | Phase | Plans Complete | Status | Completed |
 |-------|----------------|--------|-----------|
-| 1. Core Infrastructure | 2/5 | In progress | - |
+| 1. Core Infrastructure | 3/5 | In progress | - |
 | 2. Data Layer | 0/? | Not started | - |
 | 3. Git Integration | 0/? | Not started | - |
 | 4. Agent Lifecycle | 0/? | Not started | - |

.planning/phases/01-core-infrastructure/01-03-SUMMARY.md

@@ -0,0 +1,106 @@
+---
+phase: 01-core-infrastructure
+plan: 03
+subsystem: infra
+tags: [process-management, execa, child-process, lifecycle]
+
+# Dependency graph
+requires:
+  - phase: 01-01
+    provides: TypeScript project with ESM configuration
+provides:
+  - ProcessRegistry class for tracking process metadata
+  - ProcessManager class for spawning/stopping child processes
+  - Process lifecycle management infrastructure
+affects: [04-agent-lifecycle]
+
+# Tech tracking
+tech-stack:
+  added: [execa]
+  patterns: [registry-pattern, detached-processes]
+
+key-files:
+  created:
+    - src/process/types.ts
+    - src/process/registry.ts
+    - src/process/manager.ts
+    - src/process/index.ts
+  modified: []
+
+key-decisions:
+  - "In-memory registry for now (SQLite persistence in Phase 2)"
+  - "Detached processes with stdio: ignore for background operation"
+  - "5-second graceful shutdown with SIGTERM before SIGKILL"
+
+patterns-established:
+  - "Registry pattern: Map-based storage with typed CRUD operations"
+  - "Process lifecycle: spawn → track → stop with exit event handling"
+
+# Metrics
+duration: 4min
+completed: 2026-01-30
+---
+
+# Phase 1 Plan 3: Process Management Summary
+
+**ProcessRegistry and ProcessManager classes for spawning, tracking, and stopping detached child processes using execa**
+
+## Performance
+
+- **Duration:** 4 min
+- **Started:** 2026-01-30T12:12:31Z
+- **Completed:** 2026-01-30T12:16:06Z
+- **Tasks:** 2/2
+- **Files modified:** 4
+
+## Accomplishments
+
+- ProcessRegistry class with Map-based storage for process metadata tracking
+- ProcessManager class using execa for spawning detached background processes
+- Full process lifecycle support: spawn, stop, stopAll, restart, isRunning
+- Proper exit event handling to update registry status automatically
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create process types and registry** - `40a6617` (feat)
+2. **Task 2: Create process manager with spawn/stop** - `2f3df1d` (feat)
+
+## Files Created/Modified
+
+- `src/process/types.ts` - ProcessInfo, SpawnOptions, ProcessStatus type definitions
+- `src/process/registry.ts` - In-memory process registry with CRUD operations
+- `src/process/manager.ts` - Process lifecycle manager using execa
+- `src/process/index.ts` - Module barrel exports
+
+## Decisions Made
+
+| Decision | Rationale |
+|----------|-----------|
+| In-memory Map storage | Simple for now, Phase 2 adds SQLite persistence |
+| Detached mode with stdio: ignore | Background processes shouldn't block parent or inherit stdio |
+| 5-second graceful timeout | Industry standard for graceful shutdown before force kill |
+| execa over child_process | Better promise-based API, cleaner signal handling |
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+- Process infrastructure complete, ready for Phase 4 (Agent Lifecycle)
+- ProcessManager can spawn, track, and stop child processes
+- Registry provides metadata tracking foundation for agent management
+
+---
+*Phase: 01-core-infrastructure*
+*Completed: 2026-01-30*