Serialize concurrent MCP stdin writes - #33180
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## What changed - Guard executor-backed MCP stdio sends with a single-permit semaphore so a second JSON-RPC message cannot start writing while the first write is pending. - Add a regression test that drives two concurrent sends and verifies the process receives each newline-delimited message in order without overlap. GitOrigin-RevId: 30c2e51827ecf57b5eb23d9ad1e876734d6e784e
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Serialize concurrent MCP stdin writes
What changed
second JSON-RPC message cannot start writing while the first write is pending.
process receives each newline-delimited message in order without overlap.