- MediaSendingManager: surface a chat system message when a picked file
exceeds the ~10 MiB send cap instead of silently dropping the send
(voice/image/file paths), completing the 'user-visible failure'
requirement of the rollout gate
- BinaryProtocol: catch Exception instead of Throwable in decodeCore so
OutOfMemoryError is never swallowed and masked as a parse failure
- docs/file_transfer.md: mark the compressed-expansion rollout gate
resolved; support for legacy >10 MiB compressed transfers is
explicitly ended
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