Add generic streaming interpreter with configurable sources/audio

- Add stream_sexp_generic.py: fully generic sexp interpreter
- Add streaming primitives for video sources and audio analysis
- Add config system for external sources and audio files
- Add templates for reusable scans and macros
- Fix video/audio stream mapping in file output
- Add dynamic source cycling based on sources array length
- Remove old Python effect files (migrated to sexp)
- Update sexp effects to use namespaced primitives

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

sexp_effects/effects/color-adjust.sexp

@@ -1,4 +1,5 @@
 ;; Color adjustment effect - replaces TRANSFORM node
+(require-primitives "color_ops")
 
 (define-effect color-adjust
   :params (
@@ -7,5 +8,6 @@
     (saturation :type float :default 1 :range [0 2] :desc "Saturation multiplier")
   )
   (-> frame
-      (adjust :brightness brightness :contrast contrast)
-      (shift-hsv :s saturation)))
+      (color_ops:adjust-brightness brightness)
+      (color_ops:adjust-contrast contrast)
+      (color_ops:adjust-saturation saturation)))