- new suite runtime/test/test_proc.c (auto-globbed by the Makefile)
- three legs against today's behavior: echo exits 0 with exact stdout,
false exits 1, a missing command answers 127 (the execvp convention)
- record fields copied out before the vm dies; ASan clean
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
