Addresses cubic-dev-ai P1 + P2 findings on #4115.
The original PR relaxed `exitCode > 1` to `> 2` based on the (wrong)
claim that ripgrep exits 2 only on non-fatal I/O issues. ripgrep
actually uses exit code 2 for BOTH fatal errors (pattern syntax,
invalid args) AND non-fatal I/O issues; GNU grep (the fallback backend
in grep/cli.ts) likewise uses 2 for fatal errors. So `> 2` would
silently suppress fatal errors.
The correct fix is just `--no-messages`, which suppresses ripgrep's
stderr only for soft I/O issues (broken symlinks, permission denied)
while leaving fatal-error messages intact. With the gate kept at
`exitCode > 1 && stderr.trim()`:
- Broken symlink: ripgrep exits 2, stderr is empty (suppressed) →
`stderr.trim()` is falsy → gate fails → partial results survive.
- Fatal error: ripgrep exits 2, stderr has the real error message
(not suppressed by --no-messages) → gate triggers → error returned.
Reverting both `exitCode > 1` → `> 2` changes; keeping the
`--no-messages` flag additions and the regression test (test comment
updated to describe the cleaner architecture).
Verification: bun test src/tools/glob/ src/tools/grep/ → 30 pass / 0 fail.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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