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Fixes three round-2 phase-2 findings in the Command Palette JSON-RPC transport: - Non-cancellable writes: frame emission (WriteAsync/FlushAsync) no longer runs under CancellationToken.None. It is now bounded by a dedicated write timeout and linked to disposal, so a child that stops draining stdin can no longer hang a write (or the write lock) forever. On timeout or disposal the write is abandoned, the connection enters its terminal closed state (raising Disconnected so the owner tears the child down), and the caller fails fast with a transport error. Caller cancellation still never corrupts a live, reusable connection. - Malformed-body logging: the parse-failure log path now truncates the offending payload to a small cap with a marker instead of logging the full body up to the 32 MB frame cap. - Inbound request fan-out: inbound requests are drained by a fixed pool of workers through a bounded queue, replacing the untracked fire-and-forget tasks. This caps concurrency, applies backpressure to the peer when saturated, and lets disposal await the in-flight handlers cleanly. Adds unit tests covering the write timeout and disposal teardown of a stuck write, truncated logging of an oversized malformed body, and bounded inbound concurrency with clean disposal. Updates the disposal-during-write test to the new contract. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 311db8aa-f8db-47bb-943f-5447037946c7