Docs change brief

occam brief re-reads chosen documentation URLs with if_none_match and writes a folder: what is unchanged, what changed, what failed. Significant items are a keyword heuristic (deprecation / default / breaking), not a semantic changelog. It is not a new MCP tool and not occam_watch.

Recorded folders use toolchain ff-occam/1.0.0-rc.2. That is not a GitHub Release v1.0.0 certification.

Folder	What it shows
mdn-unchanged	Live recapture: same MDN hash → unchanged:true
nginx-changed	Constructed markdown to exercise significance=significant — not a live nginx.org extract
typed-failure	ok:false captcha_or_challenge preserved

occam brief --from-json docs/examples/docs-change-brief/_inputs/mdn-unchanged.json --out tmp/brief

Live:

occam brief --url https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Functions \
  --against bda66461b52d3d0aea8541e47706ebdbe09c242cc5ba2d537c3cb0293517a738 \
  --focus "function scope closures" --out tmp/brief

--resume reuses contentHash values from an existing --out folder. If a URL fails, the brief is still written. Do not fill gaps from memory.