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Udhdhav kheni
4dc3516bcc
Follow-up to #2477. The model probe it added does a real round trip, but its
final branch is the `else` of a "model 400" grep, so it swallowed spawn ENOENT,
non-executable binaries and missing vendor payloads alongside genuine network
timeouts. All three are deterministic — retrying never helps — yet they landed
in the fail-open bucket and resolved to `ready`, so every Codex pass was
skipped in silence and the review reported itself complete.
Observed live: @openai/codex was on PATH with an empty
vendor/aarch64-apple-darwin/codex/ directory. gstack said `ready` for two
months while no Codex pass ran.
Three changes:
- `_gstack_codex_model_probe` classifies deterministic install failures (exit
126/127, or stderr matching ENOENT/ENOEXEC/EACCES/"cannot execute binary
file") as MODEL_UNUSABLE_INSTALL, exit 2, never cached — a reinstall is
picked up on the next probe. Exit 124 and genuine transients still fail open,
which is what #2477 intended.
- The preflight chain captures the probe's code instead of testing it for
truthiness, so exit 2 routes to a new `broken_install` mode whose remedy is
`npm install -g @openai/codex` rather than "check your model pin". A missing
binary and an unusable model are different problems with different fixes.
- `_gstack_codex_version_check` no longer reads a broken CLI as healthy. It ran
`codex --version 2>/dev/null | head -1`, which captures head's status, not
codex's — and 2>/dev/null discarded the one diagnostic available. It now
captures the real exit code and warns on non-zero. Empty-but-successful
output stays silent, per the existing "empty output → OK" case.
Tests: 6 added to test/codex-hardening.test.ts covering both broken-install
shapes, the exit-2 contract, no caching, the transient still failing open, the
model 400 still classifying as MODEL_UNUSABLE, and the version-check warning.
845 pass / 0 fail across all 8 suites touching the changed files.
Closes #2742
Wave-amended: autoplan hand-maintained preflight chain completed (tmpl+render); install-signature grep gated on failed spawn only; goldens regenerated against the wave tree (author's golden commit 5797d326 superseded); +2 tests