nx_epic_rollup.nx

nx_epic_rollup.nx -- EPIC/UMBRELLA CLOSURE capability (operator 2026-06-13: build the team's capabilities self-sufficient, no gaps). nx_reconcile closes only TODO/WIP rows that carry a ||MARK= log-evidence pointer; dep-only EPIC rows (umbrellas decomposed into child rows, e.g. K-R2-001 = a+b+c) have NO gate of their own and so could never close without a tutor hand-flip = a no-cheat hole. This organ closes them MECHANICALLY: gate cell suffix ...||ROLLUP=child1,child2,... (the row's OWN declared closure) -> flip status TODO->DONE iff EVERY listed child row is already DONE (its own gate already proved it). Aggregation of verified children, NOT self-grading. Fixpoint loop closes nested umbrellas (a parent whose child is itself an umbrella). SELF-VALIDATING (no false-green): a baked pos control (child DONE -> parent flips) and neg control (child TODO -> parent must NOT flip) run on synthetic in-memory rows BEFORE the real queue is touched; controls fail -> RED, queue untouched. Backs up the queue (original bytes) before mutating. Only ever overwrites TODO(4)->DONE(4) in place, so length is preserved. Evidence -> knowledge/status/epic_rollup.log. license_tier: ORIGINAL