The completion guard's CI mode now compares contract text against the
evaluated commit (#2502), but it still decided which contracts a commit
owed from HEAD's registry and contract index. CI walks a branch with HEAD
at the tip (or at main after a merge), so a later commit could change an
earlier commit's verdict. If a later commit added a Shared Boundaries
reference to a file, an earlier commit that was complete when written got
blocked. If a later commit dropped ownership of a file, an earlier commit
that changed it without its contract passed. The pre-commit hook read
both from the commit's own index, so CI and the hook could still
disagree.
repo_file_io and subsystem_contracts can now read from a revision as well
as the working tree or index. A revision read uses only that commit's
tree and fails closed rather than falling back to the disk. In diff-base
mode the guard reads the registry and contract index from the evaluated
commit, as does the Prettier-only inference that --commit enables.
Replaying CI's per-commit loop over the last 120 commits on main gives
the same verdicts as before.
rcourtman
5f5f7ac7fc