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Neil
699b9a0637
* feat(files): guarded file writes that refuse to overwrite a changed file Adds an optional disk precondition to file writes: the writer compares the file on disk with an expected signature inside the write, serialized per file (path then inode), and refuses with a typed changed/missing result instead of writing. Remote hosts serve it as files.writeIfUnchanged behind a capability; older hosts get a client-side compare that fails closed, pinned to the probed runtime and connection. Undo of a delete and the MCP starter config use it to write only into a missing or identical file. Groundwork for guarding editor saves. * fix(files): pin guarded writes on the sending socket; keep refused undo; narrow not-found and pinning * fix(files): pin a guarded save to one pairing; keep only refused undo steps * fix(files): ENOENT by code only; resolve symlink chains fully; pin lost-reply recovery to the save's pairing