Fix IPFS upload: sync instead of background task

The background IPFS upload task was running on workers that don't have
the file locally, causing uploads to fail silently. Now uploads go to
IPFS synchronously so the IPFS CID is available immediately.

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

sexp_effects/primitive_libs/streaming.py

@@ -422,3 +422,20 @@ def prim_audio_beat_count(analyzer: AudioAnalyzer, t: float) -> int:
 def prim_audio_duration(analyzer: AudioAnalyzer) -> float:
     """Get audio duration in seconds."""
     return analyzer.duration
+
+
+# Export primitives
+PRIMITIVES = {
+    # Video source
+    'make-video-source': prim_make_video_source,
+    'source-read': prim_source_read,
+    'source-skip': prim_source_skip,
+    'source-size': prim_source_size,
+
+    # Audio analyzer
+    'make-audio-analyzer': prim_make_audio_analyzer,
+    'audio-energy': prim_audio_energy,
+    'audio-beat': prim_audio_beat,
+    'audio-beat-count': prim_audio_beat_count,
+    'audio-duration': prim_audio_duration,
+}