Eric Traut 82c981cafc Process-group cleanup for stdio MCP servers to prevent orphan process storms (#10710) ...

This PR changes stdio MCP child processes to run in their own process
group
* Add guarded teardown in codex-rmcp-client: send SIGTERM to the group
first, then SIGKILL after a short grace period.
* Add terminate_process_group helper in process_group.rs.
* Add Unix regression test in process_group_cleanup.rs to verify wrapper
+ grandchild are reaped on client drop.

Addresses reported MCP process/thread storm: #10581

2026-02-06 21:26:36 -08:00

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