feat(worker): close Epic 7 — draft PR + operator notes + doc-writer
- Draft PR via forge (apps/worker/src/git/pr.ts) push branch + createPullRequest draft with echodo-convoy marker, expose prUrl in Mission Control (convoy-service, convoys router, detail panel)
- Operator notes mid-build: convoy_operator_messages (0016), tRPC post/list, worker poll between tool rounds (queued) and before generateText (direct), detail panel thread for in_progress
- Doc-writer: harness doc-writer examples (docs/examples/research-pipeline.md), SOP template (docs/templates/doc-sop.md), role-doc-writer wiring
Convoy: .convoys/worker-closeout-docwriter
Co-authored-by: orchestrator
86155455a7