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/edge_detect.sexp

@@ -1,8 +1,9 @@
 ;; Edge detection effect - highlights edges
+(require-primitives "image")
 
 (define-effect edge_detect
   :params (
     (low :type int :default 50 :range [10 100])
     (high :type int :default 150 :range [50 300])
   )
-  (edges frame low high))
+  (image:edge-detect frame low high))