Add dynamic zoom and ripple amplitude to woods recipe

- Zoom now driven by audio energy via core:map-range
- Ripple amplitude reads from dynamic_params in sexp_to_cuda
- Crossfade transition with zoom in/out effect
- Move git clone before COPY in Dockerfile for better caching

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

recipes/woods-recipe-optimized.sexp

@@ -125,8 +125,8 @@
           dir (get cfg :dir)
           rot-max-a (get cfg :rot-a)
           rot-max-b (get cfg :rot-b)
-          zoom-a (get cfg :zoom-a)
-          zoom-b (get cfg :zoom-b)
+          zoom-max-a (get cfg :zoom-a)
+          zoom-max-b (get cfg :zoom-b)
           pair-angle (get pstate :angle)
           inv-a-on (> (get pstate :inv-a) 0)
           inv-b-on (> (get pstate :inv-b) 0)
@@ -140,6 +140,10 @@
           angle-a (* dir pair-angle rot-max-a 0.01)
           angle-b (* dir pair-angle rot-max-b 0.01)
 
+          ;; Energy-driven zoom (maps audio energy 0-1 to 1-max)
+          zoom-a (core:map-range e 0 1 1 zoom-max-a)
+          zoom-b (core:map-range e 0 1 1 zoom-max-b)
+
           ;; Define effect pipelines for each source
           ;; These get compiled to single CUDA kernels!
           effects-a [{:op "zoom" :amount zoom-a}
@@ -177,10 +181,20 @@
           ;; Process active pair with fused pipeline
           active-frame (process-pair-fast active)
 
-          ;; Crossfade during transition
+          ;; Crossfade with zoom during transition
+          ;; Old pair: zooms out (1.0 -> 2.0) and fades out
+          ;; New pair: starts small (0.1), zooms in (-> 1.0) and fades in
           result (if fading
-                   (let [next-frame (process-pair-fast next-idx)]
-                     (blending:blend-images active-frame next-frame fade-amt))
+                   (let [next-frame (process-pair-fast next-idx)
+                         ;; Active zooms out as it fades
+                         active-zoom (+ 1.0 fade-amt)
+                         active-zoomed (streaming_gpu:fused-pipeline active-frame
+                                         [{:op "zoom" :amount active-zoom}])
+                         ;; Next starts small and zooms in
+                         next-zoom (+ 0.1 (* fade-amt 0.9))
+                         next-zoomed (streaming_gpu:fused-pipeline next-frame
+                                       [{:op "zoom" :amount next-zoom}])]
+                     (blending:blend-images active-zoomed next-zoomed fade-amt))
                    active-frame)
 
           ;; Final effects pipeline (fused!)
@@ -198,4 +212,5 @@
       ;; Apply final fused pipeline
       (streaming_gpu:fused-pipeline result final-effects
         :rotate_angle spin-angle
-        :ripple_phase (* now 5)))))
+        :ripple_phase (* now 5)
+        :ripple_amplitude rip-amp))))