Refactor wake registry sync and fix child wake delivery

.changeset/fix-deferred-pull-wakes.md

@@ -0,0 +1,8 @@
+---
+'@electric-ax/agents-runtime': patch
+'@electric-ax/agents-server': patch
+---
+
+Fix child wake delivery so same-stream wake trigger notifications are queued while an active claim is already running, ensuring the runner checks for all pending wake rows again after the active work drains.
+
+Refactor the server wake registry to use TanStack DB collections and optimistic actions over `wake_registrations`, removing the manual ShapeStream-backed registration cache and stale-cache reload fallback.