docs(01.1-01): complete event bus foundation plan

Tasks completed: 3/3
- Install and configure Vitest test framework
- Create EventBus port interface and EventEmitter adapter
- Define domain events with typed payloads and tests

SUMMARY: .planning/phases/01.1-hexagonal-architecture/01.1-01-SUMMARY.md

.planning/phases/01.1-hexagonal-architecture/01.1-01-SUMMARY.md

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+---
+phase: 01.1-hexagonal-architecture
+plan: 01
+subsystem: events
+tags: [vitest, events, eventbus, eventemitter, hexagonal]
+
+# Dependency graph
+requires: []
+provides:
+  - EventBus port interface
+  - EventEmitterBus adapter implementation
+  - Domain event types (Process, Server, Log events)
+  - Test infrastructure with Vitest
+affects: [01.1-02, 01.1-03, 01.1-04, 01.1-05, 01.1-06]
+
+# Tech tracking
+tech-stack:
+  added: [vitest]
+  patterns: [ports-and-adapters, event-bus, domain-events]
+
+key-files:
+  created:
+    - src/events/types.ts
+    - src/events/bus.ts
+    - src/events/index.ts
+    - src/events/bus.test.ts
+    - vitest.config.ts
+  modified:
+    - package.json
+
+key-decisions:
+  - "EventBus is the PORT, EventEmitterBus is the ADAPTER"
+  - "Node.js EventEmitter wrapped behind interface for future swapability"
+  - "Domain events use discriminated union pattern with type property"
+
+patterns-established:
+  - "Port/Adapter pattern for event infrastructure"
+  - "Typed domain events with payload generics"
+  - "Test globals enabled (describe, it, expect without imports)"
+
+# Metrics
+duration: 3min
+completed: 2026-01-30
+---
+
+# Phase 1.1 Plan 01: Event Bus Foundation Summary
+
+**Vitest test framework configured with typed EventBus port/adapter pattern and domain events for process, server, and log lifecycle**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-01-30T13:50:00Z
+- **Completed:** 2026-01-30T13:55:00Z
+- **Tasks:** 3
+- **Files modified:** 6
+
+## Accomplishments
+
+- Vitest test framework installed and configured with globals, TypeScript support
+- EventBus interface (PORT) defined with emit, on, off, once methods
+- EventEmitterBus class (ADAPTER) implemented using Node.js EventEmitter
+- Domain events defined: ProcessSpawned, ProcessStopped, ProcessCrashed, ServerStarted, ServerStopped, LogEntry
+- Full test coverage for event bus patterns (10 tests passing)
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Install and configure Vitest** - `03d5527` (chore)
+2. **Task 2: Create EventBus port and adapter** - `83e6adb` (feat)
+3. **Task 3: Define domain events and write tests** - `437e76e` (feat)
+
+## Files Created/Modified
+
+- `vitest.config.ts` - Vitest configuration with globals, TypeScript, coverage
+- `package.json` - Added test scripts and vitest dependency
+- `src/events/types.ts` - EventBus port interface and domain event types
+- `src/events/bus.ts` - EventEmitterBus adapter implementation
+- `src/events/index.ts` - Public API exports and createEventBus factory
+- `src/events/bus.test.ts` - Comprehensive test suite (10 tests)
+
+## Decisions Made
+
+1. **EventBus as PORT, EventEmitterBus as ADAPTER** - Enables swapping to RabbitMQ/Kafka/WebSocket later without changing consumers
+2. **Node.js EventEmitter internally** - Simplest path to external event systems, well-tested foundation
+3. **Discriminated union for domain events** - DomainEventMap type enables type-safe event 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
+
+- Event bus foundation complete and tested
+- Ready for 01.1-02: tRPC Foundation
+- All subsequent plans can depend on the events module
+
+---
+*Phase: 01.1-hexagonal-architecture*
+*Completed: 2026-01-30*