wizard-work/forge had 39 committed verify_*.py and no CHECK; tools/verify.py
names the lane zero times. verifier_gate.py runs them, keeps one row per file
bound to the git blob the rc was measured against, and grades that ledger in
under a second. First full run at 7b42050: PASS 21 (18 of them PASS* -- they
read an absolute host root), FAIL 18, all named with causes.
Five verifiers in this lane clean up with rmtree(os.path.dirname(tmp)), i.e.
they delete $TMPDIR itself; each file now runs under its own sandbox so the
harness cannot be measured instead of the lane.