feat(FN-2848): add manual memory dream API trigger

- Add POST /api/memory/dream route that runs project and agent dream processing with AI prompt execution
- Expose triggerMemoryDreams() in dashboard legacy API client for direct dream invocation
- Switch SettingsModal and useMemoryData Dream Now actions from automation lookup to the new endpoint
- Update dashboard route, hook, and settings modal tests to cover success and error handling
- Add a patch changeset for @runfusion/fusion documenting the new endpoint and client helper

packages/dashboard/app/api/legacy.ts

@@ -632,6 +632,25 @@ export function compactMemory(
   });
 }
 
+/**
+ * Trigger manual memory dream processing.
+ * Synthesizes daily notes into dreams and promotes durable lessons to long-term memory.
+ *
+ * @param projectId - Optional project ID for multi-project support
+ * @returns Promise resolving to dream processing result
+ */
+export function triggerMemoryDreams(projectId?: string): Promise<{
+  success: boolean;
+  summary?: string;
+  dreamsWritten?: boolean;
+  longTermUpdatesWritten?: boolean;
+  error?: string;
+}> {
+  return api(withProjectId("/memory/dream", projectId), {
+    method: "POST",
+  });
+}
+
 /** Memory audit report type (mirrors @fusion/core MemoryAuditReport) */
 export interface MemoryAuditReport {
   generatedAt: string;