Initial commit: video effects processing system

Add S-expression based video effects pipeline with modular effect
definitions, constructs, and recipe files.

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

.gitignore

@@ -0,0 +1,12 @@
+# Python cache
+__pycache__/
+*.pyc
+
+# Media files
+*.mp4
+*.mkv
+*.webm
+*.mp3
+
+# Output files
+*.json