test(phase3): add comprehensive tests for multi-agent coordination
Protocol tests (16):
- AgentRequest/AgentResponse serialization
- DelegationIntent and DelegationReason validation
- CoordinationResult aggregation
- Error type tests
Coordination tests (14):
- Engine initialization and agent availability
- Delegation execution (success, error, timeout)
- Multi-intent coordination
- Streaming delegation
Librarian tests (42):
- Library-desk client (all endpoints)
- Wiki operations (search, get, create, update)
- Smart-create with HybridRAG
- Capability registration
- Response model validation
Total: 72 new tests, all passing
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>