varlink / rust / 20879319772

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fix: add error checking and CLOEXEC handling for socket activation

- Add error checking for dup2() in pre_exec
- Explicitly clear CLOEXEC flag on fd 3 after dup2 to ensure it survives exec
- Add fd validation in from_activation_fd to detect invalid fds early
  and prevent IO Safety violations

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Co-Authored-By: Claude <noreply@anthropic.com>

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