feat(robomp): added incoming PR review feature with classify and submit

- Added `review_pr` task that checks out PR head in a detached worktree, classifies rank/type/area, and posts a batched GitHub review as `event=COMMENT`.
- Added four new host tools: `fetch_pr`, `classify_pr`, `pr_review_comment`, and `submit_pr_review`; review tools self-gate on `review_mode`, push/open-PR tools refuse when `review_mode` is set.
- Added sqlite staging table `pr_review_comments` with `stage_review_comment`, `list_staged_review_comments`, and `clear_staged_review_comments` DAOs.
- Routed `pull_request.opened/reopened/ready_for_review` to `review_pr` and extended `pull_request.closed` cleanup to any tracked PR regardless of author.

python/robomp/src/server.py

@@ -340,6 +340,7 @@ def create_app(settings: Settings | None = None) -> FastAPI:
             bot_login=cfg.bot_login,
             maintainers=cfg.maintainer_logins,
             reviewer_bots=cfg.reviewer_bots,
+            pr_review_enabled=cfg.pr_review_enabled,
             resolve_issue_from_pr=_resolve,
         )