Kyle Brown 9579479d28 Collect plugin metrics from remote executors (#38283) ...

## What changed

- Resolve manifest-declared metric operations against the executor filesystem for remote plugin commands.
- Create the measurement sidecar in an executor-native, owner-private temporary directory, stream its bounded output back for validation, and clean up the directory afterward.
- Extend the exec-server protocol with the executor temporary directory and atomic private-directory creation.

## Testing

- Cover remote unified-exec measurements for foreground and background commands.
- Verify private directories use owner-only permissions on Unix and fail closed on unsupported platforms.

GitOrigin-RevId: dbbd0a84717b91237fc5728e510e18994eb46dd4

2026-08-13 00:39:04 +00:00

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