docs(phase3): closeout — PHASE3-COMPLETE.md

[AVADSA25]

Summary

Phase 3 closeout doc consolidating Steps 8/9/10 backend ships. Mirrors the Phase 1/2 closeout pattern.

Phase 3 backend status

Step	What	Tests	PR
8	Plan + Permission Contract	31	#17 (merged)
9	Background Execution + Permission Gate	30	#19 (merged)
9 fast-follow	I2 paused-on-budget + I4 cid threading + M1/M2/M4	+5	#20 (merged)
10 backend	Proactive Messaging + Auto-Escalation	25	#22 (awaiting merge)

Net Phase 3: +91 passing tests, 17 new audit events, 1 new PM2 service (codec-agent-runner), 3 new modules totaling ~1610 LOC, 17 new PWA endpoints. Same 20/73 baseline preserved.

Phase 3.5 deferrals (explicitly listed in §"open follow-ups")

• Project mode UI in codec_dashboard.html (mode dropdown + status pills polling /api/agents)
• Proactive intelligence overlay (codec_proactive.py with declarative triggers)
• Dedicated blocked_on_qwen status (Step 9 review C2)
• Read-paths runtime enforcement (Step 9 review M4)
• shift_report auto-pickup of agent activity verification
• Multi-channel notifications (macOS banner / iMessage / Telegram)
• Anchor-example end-to-end run (Marbella property bot)

Test plan

• No code changes — docs-only PR
• User reviews PHASE3-COMPLETE.md
• After approval: auto-merge

🤖 Generated with Claude Code