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This PR fixes several real crash/edge-case bugs in the VS Code Rust CLI update + tunnel flows.
It prevents keychain credentials from becoming unreadable at exact chunk boundaries and stops msgpack RPC from spinning on EOF.
It removes a few panic paths in version detection, tunnel auth and log file setup by converting them into normal errors/warnings.
It also fixes update extraction crashes for small/empty zip/tar archives.
All changes are minimal, covered by added unit tests for the keychain boundary case and cargo clippy + cargo test pass.