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3d67a98291
Codex's converge pass on PR B found a cross-cwd adoption hole: the coordinator calls loadLive(id, session.header.cwd) for HMR live-adoption, but JSONL's loadLive delegated to findLog(id, cwd) which, for cwd === undefined, scanned ALL cwd buckets. So a live NO-CWD session could adopt a same-id log from a real cwd bucket, ending with a live cwd: undefined but a persisted meta.cwd: '/w'. loadLive must treat `undefined` as the DEFINITE no-cwd bucket, not "unknown": it now goes straight to logPath(cwd, id) (which maps undefined -> _no-cwd), never the all-buckets scan. loadStored/deleteStored keep the any-cwd scan (resume/removal identify by id alone), so findLog is now a pure scan-all and loses its dead cwd-direct branch. The coordinator's has() relied on loadLive(id, undefined) meaning "any scope" for an untracked id — fixed to use loadStored for the untracked (unknown-cwd) case and loadLive only for a tracked session's known cwd. Adds a regression test: a no-cwd live session reusing an id persisted in a real cwd bucket no longer cross-cwd-adopts — it falls through to createCore's any-cwd collision probe and REJECTS, leaving the original log untouched. Also fixes the README to say `tornMarker !== undefined` (a marker may be falsy, 0).