Reconcile Master Blueprint ADR-0240–0253 titles with the live Accepted
registry without renumbering history. Claim ADR-0253 for the freeze policy
itself; reserve 0254–0261 for Blueprint gaps. Document packs/data vs
packs/he|grc dual boundary and pin serve isolation in smoke/packs suites.
[Verification]: Smoke 180 passed (includes 4 dual-pack boundary pins)
