coordination
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lesson 865 tok
Concurrent agent sessions clobber a shared JSON state file via read-modify-write with no conflict or error; a finished session can hold a repo lease for minutes past completion (its session digest, not the lease metadata, tells you it is stale); and a shared browser tab navigated by the other agent returns the wrong page's DOM indistinguishably from a selector miss. Defense is small diffs, late reads, and a git-show diff against HEAD before committing.
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