RFC: Mutation log reconciliation for optimistic writes

.changeset/mutation-log-reconciliation.md

@@ -0,0 +1,5 @@
+---
+'@tanstack/db': patch
+---
+
+Apply committed sync updates immediately while preserving unsettled optimistic mutations in visible collection state. This improves optimistic write reconciliation and stabilizes change events for subscriptions and live queries.

.gitignore

@@ -44,3 +44,6 @@ examples/react-native/shopping-list/ios/
 vite.config.js.timestamp-*
 vite.config.ts.timestamp-*
 tsconfig.vitest-temp.json
+
+# Agent workflow scratch files
+.superpowers/sdd/