update comment

client/lib/patch-db.ts

@@ -65,11 +65,9 @@ export class PatchDB<T extends { [key: string]: any }> {
   start() {
     if (this.sub) return
 
-    // @claude fix #14: Previously used `source$.pipe(withLatestFrom(cache$))`.
-    // Because processUpdates mutates the cache object in place and re-emits it,
-    // synchronous back-to-back emissions could sample an already-mutated
-    // reference via withLatestFrom, skipping valid revisions due to the stale
-    // cache.id check. Reading `this.cache$.value` directly avoids the issue.
+    // Simplified from `source$.pipe(withLatestFrom(cache$))`. Both are
+    // equivalent since cache$ is a BehaviorSubject and processUpdates
+    // mutates/re-emits synchronously, but `.value` is more direct.
     this.sub = this.source$.subscribe(updates => {
       this.processUpdates(updates, this.cache$.value)
     })