feat: batch PM work into hourly autopilot sweep

[gf5901]

Summary

• PM now runs on a schedule, not reactively. Instead of the poller triggering PM chat replies within 15 seconds, messages queue up and the hourly Autopilot Lambda triggers run_task.py --pm-reply via SSM. The PM processes all accumulated chat messages AND reviews human-assigned tasks with pending replies in a single agent session.
• Human-assigned task replies handled by the PM. When a human comments on a PM-created task (e.g. answering a DNS confirmation question), the generic comment reply agent no longer runs. Instead, the PM reviews the response during its next sweep and can mark the task complete, post follow-ups, or create engineering tasks.
• Comment reply prompts now include task context. Both the regular COMMENT_REPLY_PROMPT and new HUMAN_TASK_REPLY_PROMPT include the task title and description, so the agent understands what it's replying to.

Files changed (13)

Area	Files	What
Poller	run_poller.py	Remove PM reply spawning; skip human tasks with project_id in reply loop
PM Agent	src/pm_agent.py	Enhanced run_pm_reply to load human tasks, build context, process complete_tasks/reply_to_tasks JSON actions
Pipeline	src/pipeline.py	New HUMAN_TASK_REPLY_PROMPT; run_comment_reply defers human+project tasks to PM, uses task-aware prompts
Store	src/dynamo_store.py	New list_human_reply_pending_for_project() using project-index GSI
Lambda API	infra/packages/api/src/routes/tasks.ts	Comment endpoint sets reply_pending on PROJECT for human-assigned tasks
Autopilot Lambda	infra/packages/autopilot/src/index.ts	Scans for reply_pending projects, triggers PM sweep via SSM
Types	infra/packages/api/src/lib/types.ts	Updated comment on reply_pending
Docs	AGENTS.md, src/AGENTS.md, docs/dynamo-schema.md, .cursor/rules/project-conventions.mdc	Updated to reflect new PM sweep flow
Tests	tests/test_runner_helpers.py	3 new tests: human task deferred to PM, human task fallback prompt, task context in prompts

Test plan

• All 331 existing tests pass
• 3 new tests for human-assigned task comment reply behavior
• No TypeScript errors in changed Lambda files
• Deploy Autopilot Lambda (SST) to activate hourly PM sweep
• Post a project chat message → verify it queues (no immediate reply) → verify PM replies on next hourly tick
• Comment on a human-assigned task with a project → verify poller skips it → PM handles it on next sweep

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