docs(adr): ADR-0145 amended — a ui-only tombstone's R is judged against the fixed group's @objectstack/spec@M.0.0 cut, and D1 names the ADR-0087 level-half amendment

docs(adr): ADR-0145 amended — a ui-only tombstone's R is judged against the fixed group's @objectstack/spec@M.0.0 cut, and D1 names the ADR-0087 level-half amendment #2905