Re-port of the PR's version gate onto the decomposed layout: the field and
parser live in plugins_manifest.py (with running_hermes_version /
version_satisfies helpers), the load-time skip in plugins_loader.py
before any import. Unsatisfied plugins record an error and never run
register(); one invariant test proves both halves.
For each issue anchor present in BASE 63279301bc non-test .py and absent on HEAD, the BASE comment/docstring block was re-attached at the HEAD location of the code it explained (matched by the distinctive code line / enclosing def). Sentences already covered by an existing HEAD comment were deduped; the issue number always survives. Insert-only: no code lines changed.
Teknium