[RFC-0007] Implement Project domain

[copyleftdev]

TASK-004: Implement Project domain

RFC: RFC-0007 - Domain Model
Component: Project Domain
Estimate: m

Description

Create Project, Issue, ChecklistItem. Handle 4 project events.

Acceptance Criteria

• AC-001: All 14 domains implemented
  • Verification: Each domain module exists
• AC-002: All 122 event types mapped
  • Verification: Cross-reference asyncapi.yaml

Dependencies

Depends on: TASK-002