Candidate db463a7b…ab89 (5 files) on 277d1fa21. Adds the note-2 test for a thread
decision raised before row 121; mutants 6 of 6 killed after fixing the test to
supersede an open decision (first run left M6 alive, recorded). Owner's gate exit 0;
gate.sh now sets COMPOSE_PROJECT_NAME=dewey-r136 and removes its network at exit.
Co-Authored-By: Claude Opus 5.5 <[email protected]>