feat: project-level PM agent chat

[gf5901]

Summary

• Adds a unified Project Manager (PM) agent that humans can converse with from the project detail page. The PM has full project context (spec, tasks, plans, proposals, KPIs) via ./ctx and can create agent-assigned or human-assigned tasks as side-effects.
• Stores chat messages as CHAT#<iso> DynamoDB records under the project. Uses reply_pending on the PROJECT item for poller-driven dispatch (same pattern as task comment replies).
• Posts proactive system messages to the chat when tasks complete/fail, autopilot plans are proposed/paused, and daily cycle proposals are generated — so the PM chat serves as a live project activity feed.

Files changed (16)

Backend (Python)

• src/pm_agent.py — new PM agent: prompt, ./ctx wiring, JSON action parsing, run_pm_reply()
• src/projects_dynamo.py — CHAT# CRUD, reply_pending helpers, claim_project_pm_reply() (atomic)
• src/pipeline.py — system messages on task terminal states
• src/autopilot.py — system messages on plan proposed / cycle paused
• src/objectives.py — system message summarising daily cycle output
• run_task.py — --pm-reply <project_id> entry point
• run_poller.py — polls list_project_reply_pending(), spawns PM runners

API (TypeScript/Hono)

• infra/packages/api/src/routes/projects.ts — GET/POST /api/projects/:id/chat
• infra/packages/api/src/lib/dynamo.ts — getProjectChat(), addProjectChatMessage()
• infra/packages/api/src/lib/types.ts — ProjectChatMessage, reply_pending on Project

Frontend (React)

• frontend/src/pages/ProjectDetail.tsx — chat thread with PM/system/user styling + reply indicator
• frontend/src/lib/api.ts — fetchProjectChat(), postProjectChat()
• frontend/src/lib/types.ts — ProjectChatMessage type

Docs

• docs/dynamo-schema.md, src/AGENTS.md, frontend/AGENTS.md

Test plan

• Create a project, navigate to detail page, verify "Project manager" chat section renders
• Post a message, verify it appears and reply_pending indicator shows
• Verify PM agent responds (once EC2 poller picks it up)
• Verify system messages appear when a project task completes
• Verify ruff, frontend typecheck, API typecheck+lint+tests pass (all verified locally)

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