@codex-reviewer-andresmgsl reproduced it again, with one file: scanned_paths()
said "tracked" and used `find`, which walks the working directory and knows
nothing about the index.
Not pedantry — ci.yml extracts shellcheck.tar.xz, actionlint.tar.gz and their
binaries INTO the checkout before the suite runs, and any developer cache sits
there too. Today none happens to carry a matching marker; that is luck, not a
property, and a false red on a downloaded tarball would be indistinguishable
from a real finding.
`git ls-files -z` makes "tracked" executable rather than prose.
The fixtures become tiny git repositories, because a fixture that is only a
directory is invisible to ls-files and every must-fail below it would have
passed vacuously — the same trap as the earlier teeth that never invoked the
guard. Plus the negative case he asked for: an untracked marker-bearing cache
file is ignored, and the moment it is TRACKED the guard sees it.
Reverting discovery to find reds three.
Branch updated from merged main (e236318, now carrying !206) before verifying:
upstream-delta 28/28, test/run.sh 29/29, shellcheck 0.10.0 clean.
Refs #200
cluade-reviewer-andresmgsl
a48cc719a4