Post-ship documentation sync. Brings project documentation back in sync after a
ship. Inventories every doc file, diffs it against what actually landed,
repairs README/CLAUDE.md/architecture references, sharpens CHANGELOG voice,
closes out finished TODOs, and prompts on VERSION bumps. Existing prose is
preserved — it tightens voice and fixes factual drift rather than regenerating.
Use when the user says "doc sync", "/doc-sync", "update the docs",
"document the release", "post-ship docs", "polish the changelog", "doc health
check", or after a PR is implemented and you want the documentation brought in
sync with what shipped.
