# Task ID: 127

**Title:** EpicTask repository and service layers

**Status:** pending

**Dependencies:** 117, 123

**Priority:** medium

**Description:** Create EpicTaskRepository and EpicTaskService with edge graph management and cycle detection

**Details:**

Create src/mcpd/src/repositories/epic-task.repository.ts and src/mcpd/src/services/epic-task.service.ts:
1. Repository: CRUD for EpicTask, edge CRUD for EpicTaskEdge, findByEpicId
2. Service.addEdge(): before creating edge, walk toId's transitive dependencies (via dependsOn edges), reject if fromId is reachable (cycle detection)
3. Service.removeEdge(): simple delete
4. Service.getGraph(): return nodes with edges for visualization
5. Service.computeCompleteness(): calculate percentage of doneCriteria met per node
6. Follow existing repository/service patterns

**Test Strategy:**

Unit tests: test edge creation, test cycle detection rejects A→B→C→A, test completeness calculation with mixed met/unmet criteria, test transitive dependency walk.