chore: vendor react-best-practices agent skill for cursor agents

Adds the Vercel skill under .agents with famapp path patterns.

Includes skills-lock.json pin.

.agents/skills/react-best-practices/upstream/rules/async-defer-await.md

@@ -0,0 +1,80 @@
+---
+title: Defer Await Until Needed
+impact: HIGH
+impactDescription: avoids blocking unused code paths
+tags: async, await, conditional, optimization
+---
+
+## Defer Await Until Needed
+
+Move `await` operations into the branches where they're actually used to avoid blocking code paths that don't need them.
+
+**Incorrect (blocks both branches):**
+
+```typescript
+async function handleRequest(userId: string, skipProcessing: boolean) {
+  const userData = await fetchUserData(userId);
+
+  if (skipProcessing) {
+    // Returns immediately but still waited for userData
+    return { skipped: true };
+  }
+
+  // Only this branch uses userData
+  return processUserData(userData);
+}
+```
+
+**Correct (only blocks when needed):**
+
+```typescript
+async function handleRequest(userId: string, skipProcessing: boolean) {
+  if (skipProcessing) {
+    // Returns immediately without waiting
+    return { skipped: true };
+  }
+
+  // Fetch only when needed
+  const userData = await fetchUserData(userId);
+  return processUserData(userData);
+}
+```
+
+**Another example (early return optimization):**
+
+```typescript
+// Incorrect: always fetches permissions
+async function updateResource(resourceId: string, userId: string) {
+  const permissions = await fetchPermissions(userId);
+  const resource = await getResource(resourceId);
+
+  if (!resource) {
+    return { error: "Not found" };
+  }
+
+  if (!permissions.canEdit) {
+    return { error: "Forbidden" };
+  }
+
+  return await updateResourceData(resource, permissions);
+}
+
+// Correct: fetches only when needed
+async function updateResource(resourceId: string, userId: string) {
+  const resource = await getResource(resourceId);
+
+  if (!resource) {
+    return { error: "Not found" };
+  }
+
+  const permissions = await fetchPermissions(userId);
+
+  if (!permissions.canEdit) {
+    return { error: "Forbidden" };
+  }
+
+  return await updateResourceData(resource, permissions);
+}
+```
+
+This optimization is especially valuable when the skipped branch is frequently taken, or when the deferred operation is expensive.