# Task ID: 130

**Title:** Task service with lifecycle state machine

**Status:** pending

**Dependencies:** 129

**Priority:** medium

**Description:** Create TaskService implementing the full task lifecycle with transition guards and event logging

**Details:**

Create src/mcpd/src/services/task.service.ts:
1. Define VALID_TRANSITIONS map: { [fromState]: [allowedToStates] } based on PRD lifecycle diagram
2. transition(id, toState, actorType, actorId, note): check transition is valid, call repo.transition, if success create TaskEvent, return result
3. assign(id, agentId): set assigneeId
4. recordVerdict(id, stage, agentId, commit, passed, summary, findings): create TaskVerdict, if failed transition back to in_progress
5. accept(id, userId, note): transition to merged, trigger merge via GitProvider
6. reject(id, userId, note): transition to in_progress
7. reopenOnPostMergeFailure(id): transition merged→reopened

**Test Strategy:**

Unit tests: test all valid transitions succeed, test invalid transitions throw, test TaskEvent created on every transition, test verdict creation, test accept triggers merge.