Corrects the react-doctor PR-check command and workflow filename, marks the
superseded hooks-tarball surprises now that bitsocial-react-hooks comes from
npm, rewrites hooks-setup.md around the real per-harness entry points and drops
its drifted inline script copies, points the Task Router translations row at
the translate skill, and adds a committed skills/subagents index so agents can
discover the tooling that already exists.