fix(B-0441): re-open per parent-child status invariant (B-0532)

docs/BACKLOG.md

@@ -257,7 +257,7 @@ are closed (status: closed in frontmatter)._
 - [ ] **[B-0436](backlog/P1/B-0436-demo-hamiltonian-to-git-visualization-2026-05-13.md)** Demo — Hamiltonian-to-git visualization (git history → phase-space rendering)
 - [x] **[B-0437](backlog/P1/B-0437-demo-ux-of-math-panel-bivector-fingerprints-2026-05-13.md)** Demo — UX-of-math panel (bivector fingerprints, partial-credit scoring)
 - [ ] **[B-0440](backlog/P1/B-0440-standing-by-failure-mode-detector-background-service-2026-05-13.md)** Standing-by failure-mode detector — background service that catches idle-foreground + nudges via bus
-- [x] **[B-0441](backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md)** Backlog-row-ready-to-grind notifier — background service that proactively assigns claims when agent queue empty
+- [ ] **[B-0441](backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md)** Backlog-row-ready-to-grind notifier — background service that proactively assigns claims when agent queue empty
 - [x] **[B-0442](backlog/P1/B-0442-missed-substrate-cascade-detector-background-service-2026-05-13.md)** Missed-substrate cascade detector — background service that catches branch-vs-merged-PR drift (e.g., Otto-section-missed-PR-2980-by-3-min class)
 - [x] **[B-0445](backlog/P1/B-0445-csharp-fluent-operator-surface-pm2-2026-05-13.md)** C# fluent operator surface — Map, Filter, Join, Distinct, Window via idiomatic CSharp API
 - [ ] **[B-0448](backlog/P1/B-0448-cloud-routines-integration-4th-catch-43-defence-layer-2026-05-13.md)** Cloud Routines integration — 4th catch-43 defence layer via Anthropic-hosted scheduled tasks + API + GitHub event triggers

docs/backlog/P1/B-0441-backlog-row-ready-to-grind-notifier-background-service-2026-05-13.md

@@ -1,7 +1,7 @@
 ---
 id: B-0441
 priority: P1
-status: closed
+status: open
 title: "Backlog-row-ready-to-grind notifier — background service that proactively assigns claims when agent queue empty"
 tier: factory-infrastructure
 effort: M
@@ -176,3 +176,11 @@ Using the canonical per-service slice ordering from `tools/bg/README.md`:
 
 Slices 1, 2, 4 are live in `tools/bg/backlog-ready-notifier.ts` (per README "1+2+4 live").
 B-0460 depends on B-0449 (subscriber library design pass); B-0500/B-0501/B-0502 are independent.
+
+## Closure status (2026-05-16)
+
+**Notifier-side: complete.** All 8 acceptance criteria checked (slices 1, 2, 3, 4, 5a, 6 shipped per the decomposition table; tests in `tools/bg/backlog-ready-notifier.test.ts`; launchd plist via B-0502; docs in `docs/AUTONOMOUS-LOOP.md`). Empirically confirmed live during the 2026-05-16 session via `bun tools/bg/backlog-ready-notifier.ts --once` — returned the documented JSON shape with `queueBusy: true` correctly suppressing publication.
+
+**Row stays `status: open`** because child **B-0460** (slice 5.2, agent-side subscriber handler) is genuinely the remaining unshipped scope, and the `--enforce-parent-child-status` lint (B-0532 gate) correctly requires parent rows to stay open while any child is open. Closing this row would violate that invariant.
+
+When B-0460 lands and closes, this row is ready to flip to `closed` with no further substrate work.