`git diff --name-only` only shows tracked files with unstaged
modifications. It does not show untracked files — which is precisely
the state of any new test file @test creates, since @test's sandbox
denies `git add`. The pre/post snapshots therefore both missed new
files entirely and `comm -23 post pre` returned nothing, letting the
gate cheerfully conclude nothing changed even when @test had just
created tests/foo.rs (or, worse, src/lib.rs).
Switch both snapshots to `git status --porcelain | sed 's/^...//'
| sort -u`, which captures modified, staged, and untracked files in
a single pass. Inline rationale notes the untracked blind spot so
the orchestrator does not fall back to git diff.
Harald Hoyer
f0cc300358