Run write_stdin concurrently across terminal sessions - #33645
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## What changed - Allow parallel `write_stdin` tool calls to interact with independent terminal sessions. - Serialize reads and writes within each session so its output buffer and process lifecycle remain consistent. - Prevent active sessions from being pruned while a `write_stdin` interaction is in progress. ## Testing - Added unified exec and code mode coverage that uses two terminal sessions concurrently and verifies output from both. GitOrigin-RevId: 618f5503f4c4670421f680c0f0c27414bc6b2ddd
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Run
write_stdinconcurrently across terminal sessionsWhat changed
write_stdintool calls to interact with independent terminal sessions.write_stdininteraction is in progress.Testing