Operator direction: leave the skill sweep for the stage close. GA-R6 ties the
sweep to a STAGE close and this session closed none; batching it there also avoids
regenerating the dated Chat snapshot twice.

The candidate is recorded rather than left in the transcript -- which is the exact
failure this session's close sweep spent its time correcting. It is a COMPLEMENT
to an existing skill invariant, not a new one: "a checker that cannot fail is not
a gate" has an inverse that also bites. Three gates built this session could only
ever FAIL, because everything they assert was absent, and each needed a
constructed fixture case to prove it could go GREEN. dc-node-v6-carve then
demonstrated it live, flipping dc0 to PASS while dc1 still read FAIL.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HvCyrwvYTTcDYnRErfMsNf