ceremony/changelog.d/151.md

• Doctrine names the second Closes #N exception: a same-repo PR whose authorizing issue marks an acceptance criterion post-merge uses Refs #N, and triage closes the issue by hand on the evidence — merging #143 auto-closed #137 with exactly such a criterion unmet, and no role had been told otherwise. TRIAGE.md now requires a post-merge criterion to carry its own mechanism (post-merge, triage closes, Refs #N), REVIEWER.md lists Refs #N beside Closes #N and Part of <owner>/<repo>#N and stops treating the reference-only PR as a defect, and CONTRIBUTING.md points at BUILDER.md as the rule's one home (#151).