feat: Add fast startup fetch and background caching

- Add  for quick startup using first N feeds
- Add background thread for full fetch and caching
- Update  to use fast fetch
- Update docs and skills

engine/pipeline/adapters/camera.py

@@ -62,6 +62,16 @@ class CameraClockStage(Stage):
         if data is None:
             return data
 
+        # Update camera speed from params if explicitly set (for dynamic modulation)
+        # Only update if camera_speed in params differs from the default (1.0)
+        # This preserves camera speed set during construction
+        if (
+            ctx.params
+            and hasattr(ctx.params, "camera_speed")
+            and ctx.params.camera_speed != 1.0
+        ):
+            self._camera.set_speed(ctx.params.camera_speed)
+
         current_time = time.perf_counter()
         dt = 0.0
         if self._last_frame_time is not None: