feat: add formal for pll, sysctrl and rcu

scripts/README.md

@@ -8,6 +8,11 @@ Scripts are part of the build contract. Prefer existing helpers over ad-hoc
 shell behavior, preserve structured JSON results, and keep setup/download
 behavior controlled by `config/dependencies.lock.json`.
 
+`publish_fatfs_artifact.sh` is the manual release helper for the lock-pinned
+FatFs R0.16 archive. It verifies the archive, GitHub authentication, release
+absence, and the published asset checksum before reporting the checksum-pinned
+URL.
+
 Update or add tests in [`../tests`](../tests) for script behavior. Run
 `ruff check .` and `python3 -m pytest -q`; build-flow changes also require the
 relevant dry-run or regression profile from [`AGENTS.md`](../AGENTS.md).