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/bloom.sexp

@@ -1,4 +1,5 @@
 ;; Bloom effect - glow on bright areas
+(require-primitives "image" "blending")
 
 (define-effect bloom
   :params (
@@ -11,5 +12,5 @@
                      (if (> (luminance c) threshold)
                          c
                          (rgb 0 0 0)))))
-         (blurred (blur bright radius)))
-    (blend-mode frame blurred "add")))
+         (blurred (image:blur bright radius)))
+    (blending:blend-mode frame blurred "add")))