babysit-pr

Babysit an existing PR by running the manifest workflow. This is the author-side companion to `review-pr`: `review-pr` applies reviewer pressure through PR comments and thread advancement; `babysit-pr` drives the author-side lifecycle toward green and mergeable. They coordinate only through GitHub PR state and the Manifest. **Inputs.** Accept a PR URL, `--manifest <path>`, both, or neither, plus `--no-log` to disable the default journal. No PR URL means infer the current branch's upstream/open PR; halt with an actionable error when no single PR can be inferred. `--manifest <path>` supplies the strongest PR grounding and skips fresh synthesis. Without `--manifest`, invoke `define` with `--babysit <pr-url> --autonomous`, read its `Manifest complete:` path, then continue. **Logging.** Unless `--no-log` is present, keep a persisted append-only journal across the tend, so a warm session that compacts mid-lifecycle keeps continuity — what was already tried and abandoned, and operational notes (retriggers, waits). It carries the **dead-end memory** GitHub state can't reconstruct: fixes attempted and reverted, approaches considered and rejected that left no commit. The default path is `~/.manifest-dev/logs/babysit-<owner>-<repo>-<N>.md` (`~` = `$HOME` / `%USERPROFILE%`; keyed to the PR so a warm reinvocation re-finds it; create the dir, fall back to a writable temp path only when home isn't writable). Resume an existing file, create a new one. Append only — never rewrite prior entr...