fix: return stall feedback in send_message response (#1325)

[OneStepAt4time]

Summary

• Issue: bug: send_message returns no feedback when session is stalled #1325 — send_message returns no feedback when session is stalled
• Root cause: sendMessage() only returned {delivered, attempts} with no awareness of stall state
• Fix: Query SessionMonitor.getStallInfo() before sending and include stall info in the response

Changes

• monitor.ts: Add public getStallInfo(sessionId) method — returns {stalled: true, types: [...]} or {stalled: false}
• session.ts: sendMessage() accepts optional stallInfo param, includes it in return when provided
• server.ts: HTTP handler queries monitor for stall info before sending, includes stall field in response
• mcp-server.ts: Updated SendMessageResponse interface and tool description to surface stall info
• stall-detection.test.ts: 4 new tests for getStallInfo (empty, active, cleared, removed)

Response examples

Not stalled:

{ "ok": true, "delivered": true, "attempts": 1 }

Stalled (extended thinking):

{ "ok": true, "delivered": true, "attempts": 1, "stall": { "stalled": true, "types": ["thinking"] } }

Stalled (permission prompt):

{ "ok": true, "delivered": true, "attempts": 1, "stall": { "stalled": true, "types": ["permission"] } }

Test plan

• npx tsc --noEmit — no new type errors
• npm test — 5521 tests pass (4 new)
• Manual: send message to a session in extended thinking, verify stall field in response

Aegis version

Developed with: v2.9.0

Closes #1325

Generated by Hephaestus (Aegis dev agent)

[OneStepAt4time]

🔧 PR #1612 CLEAN. Ready for review.

[aegis-gh-agent]

✅ Approved.

Issue #1325 — Surface stall info in send_message response.

Clean implementation:

• SessionMonitor.getStallInfo() returns active stall types or { stalled: false }
• Propagated through sendMessage() → API response → MCP tool
• MCP tool description updated to document stall feedback
• 4 test cases: no stall, multiple stall types, cleared stalls, removed session
• No breaking changes — stall field is optional in response

5 files, 65 lines. CI green.