jif 274d41a398
Prevent Linux ETXTBSY races in MCP stdio tests ( #48724 ) ...
## Why
Concurrent test spawns can inherit a writable descriptor for the MCP server
wrapper, causing `ETXTBSY` when launching it on Linux.
## What changed
Write the wrapper through a separate `/bin/sh` process on Linux so its writable
descriptor stays out of the test process. Check the writer's exit status and
include stderr on failure. Retain direct file writes on other Unix platforms.
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jif
274d41a398