docs(phase3-step10): TDD implementation plan — Proactive Messaging + Project Mode UI

[AVADSA25]

Summary

TDD implementation plan for Phase 3 Step 10 — Proactive Messaging + Project Mode UI. The final piece of Phase 3.

11 tasks, ~25 tests, 1693 lines.

What Step 10 builds

User-facing layer of Phase 3:

• codec_agent_messaging.py — agent → user message dispatch, 60s batching window (Q10), silence kill-switch
• _run_agent (Step 9) gets post_message calls at 5 lifecycle points
• Chat handler runs Qwen-3.6 classifier with 2-signal gate; on user "No", silences for that session (Q11)
• PWA UI: "Project" mode dropdown + agent status pills polling /api/agents every 5s
• 3 PWA endpoints: GET /messages, POST /messages (user reply), POST /silence

Plus 3 audit events and AGENTS.md docs.

Phase 3.5 deferral

Proactive intelligence overlay (observer-driven contextual nudges) explicitly NOT in Step 10, per Q12. Will ship as Phase 3.5 after Steps 8-10 are battle-tested.

After this lands

Phase 3 complete. docs/PHASE3-COMPLETE.md will follow (matching Phase 1+2 pattern).

🤖 Generated with Claude Code