Andrew Phillips 0af74000d2 fix: eliminate unsafe code via nix, command-fds, and thread-local cookie ...

Replace 4 unsafe sites with safe wrappers:

- libc::pipe2 → nix::unistd::pipe2 (safe OwnedFd return)
- File::from_raw_fd → File::from(OwnedFd) (safe ownership transfer)
- unsafe impl Send for SendCookie → thread_local! lazy Cookie
  (each thread gets its own independent Cookie, no Send needed)
- pre_exec + libc::fcntl → command-fds crate fd_mappings()
  (handles CLOEXEC clearing safely, also fixes potential fd leak
  on spawn failure via OwnedFd RAII)

Only libc::umask remains as a single unavoidable unsafe site
(no safe Rust wrapper exists for the umask syscall).

Also updates AGENTS.md to remove stale SendCookie exception.

2026-03-14 16:01:54 -03:00

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