diff --git a/docs/plans/2026-07-21-gamewindow-slice-3-live-session.md b/docs/plans/2026-07-21-gamewindow-slice-3-live-session.md
index 3558a00a..3a602279 100644
--- a/docs/plans/2026-07-21-gamewindow-slice-3-live-session.md
+++ b/docs/plans/2026-07-21-gamewindow-slice-3-live-session.md
@@ -18,8 +18,12 @@ character-selection UI or redesign the transport.
   canonical-account F657, exact F653 confirmation, negotiated-state
   Disconnect symmetry, closed-channel/flood-safe confirmation wait, and
   deterministic shutdown tests. Release: 6,605 passed / 5 skipped.
-- [ ] A — owned subscription primitives (in progress).
-- [ ] B — session event and command routers.
+- [x] A — owned subscription primitives (`7d452aa6`): exact nested
+  GameEvent registration tokens, reverse/idempotent subscription ownership,
+  transactional wiring construction, and adversarial unregister,
+  reentrancy, replacement, and concurrent-dispose coverage. Release: 6,621
+  passed / 5 skipped.
+- [ ] B — session event and command routers (in progress).
 - [ ] C — convergent session reset.
 - [ ] D — complete lifecycle controller.
 - [ ] E — GameWindow cutover.