streaming-angular Actual framework app and LangGraph runtime; existing aimock responses, 12-character chunks with 100ms fixture delay. No live provider requests. Footage runs at actual speed; initial page loading is trimmed. No narration. Input: Tell me one quick fact about Angular signals in two sentences. 00:00:00.000 Send a message. 00:00:03.822 Read the arriving response. 00:00:10.227 The response is complete. Final visible result: Tell me one quick fact about Angular signals in two sentences. Angular signals are a reactive primitive (signal, computed, effect) that track dependencies to provide fine-grained reactivity and more efficient change detection. They let you update state synchronously via set()/update() and ensure only consumers that read an affected signal are re‑evaluated.