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/config.py

@@ -37,6 +37,7 @@ class Settings(BaseSettings):
     git_author_name: str | None = Field(None, alias="ROBOMP_GIT_AUTHOR_NAME")
     git_author_email: str = Field(..., alias="ROBOMP_GIT_AUTHOR_EMAIL")
     repo_allowlist_raw: str = Field("", alias="ROBOMP_REPO_ALLOWLIST")
+    pr_review_enabled: bool = Field(True, alias="ROBOMP_PR_REVIEW_ENABLED")
 
     # gh-proxy. Set BOTH to route GitHub through the proxy; leave both empty
     # to keep PAT-on-orchestrator behavior. Mixing the two (PAT + proxy) is