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/hue_shift.sexp

@@ -9,4 +9,4 @@
     (speed :type int :default 0 :desc "rotation per second")
   )
   (let ((shift (+ degrees (* speed t))))
-    (shift-hsv frame shift 1 1)))
+    (color_ops:shift-hsv frame shift 1 1)))