Context

Implement the message and communication domain models per DESIGN_SPEC Section 5.

Models to Implement

• Message - id, timestamp, from, to, type, priority, channel, content, attachments, metadata (DESIGN_SPEC 5.3)
• Channel - name, type, subscribers
• MessageType - task_update, question, announcement, review_request, etc.
• CommunicationConfig - default pattern, bus config, meeting config, hierarchy config (DESIGN_SPEC 5.4)
• LoopPreventionConfig - max depth, rate limits, dedup window, circuit breaker (DESIGN_SPEC 5.5)

Acceptance Criteria

• Message model matches DESIGN_SPEC 5.3 schema
• Communication config matches DESIGN_SPEC 5.4
• Loop prevention config matches DESIGN_SPEC 5.5
• Unit tests

Dependencies

• Core entity models issue (M1)

Design Spec Reference

Sections 5.3, 5.4, 5.5