[TEST1] Smoke tests for APIs (link create/list, proposed answer, notifications emit, chat, termination)

[zhn1010]

Priority: High
Type: Implementation
Est: 3h
Original Ref: TEST1

Dependencies

• [QL-API1] Proposed answer create API (validation, auth) #74
• [QL-API2] Link create/list APIs (targeted/broadcast, restriction rules, relationshipStrength) #76
• [RT-API1] Realtime chat send/receive + history endpoints (auth) #96
• [N-EMIT2] Implement emitters; wire into mutations (QL1, QL2, MQ2, MQ7, LP1, QL5) to write/publish notifications #98
• [MQ7] Terminate quest flow (confirm, set status, disable new links/answers) #92