The PTY runtime exported an empty NODE_CHANNEL_FD to override the daemon's
IPC descriptor, because bun-pty merges the native environ back into the
child and a JS-only delete does not stick. Node CLIs launched from the
shell (opencode, claude) then printed "warn: Failed to parse IPC channel
number ''" on exit.
The Linux-only env -u ARGV0 wrapper now applies on macOS and Linux and
also unsets NODE_CHANNEL_FD, so the variable is gone instead of empty.
Testing: runtime and inherited-env tests updated for the POSIX wrapper;
verified in the running app that exiting opencode no longer prints the
warning.
Bohdan Triapitsyn
ff75dc9bd5