The second build of every repo-kind crate in a subdirectory failed (6 October 2026, 18:51 UTC, the pool build: "tree not
clean after reset: ?? pool/.build-remote-sha-target"): checkout_tree keeps the stamps with `git clean -e` at any depth but
its status check matched them at the root only. The check now reads `git status --porcelain --untracked-files=all` (an
all-untracked directory is listed file by file, not as "?? sub/") and accepts target dirs, sccache and both stamps under
any path. The self-test carries the subdirectory case (stamp and target dir kept, overlay file removed) and the known-failed
case (a stray untracked file still fails the check).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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