Add live video streaming for in-progress renders

tasks/streaming.py

@@ -255,7 +255,12 @@ def run_stream(
     # Create temp directory for work
     work_dir = Path(tempfile.mkdtemp(prefix="stream_"))
     recipe_path = work_dir / "recipe.sexp"
-    output_path = work_dir / output_name
+
+    # Write output to shared cache for live streaming access
+    cache_dir = Path(os.environ.get("CACHE_DIR", "/data/cache"))
+    stream_dir = cache_dir / "streaming" / run_id
+    stream_dir.mkdir(parents=True, exist_ok=True)
+    output_path = stream_dir / "output.mp4"  # Always mp4 for streaming
 
     # Create symlinks to effect directories so relative paths work
     (work_dir / "sexp_effects").symlink_to(sexp_effects_dir)
@@ -438,7 +443,9 @@ def run_stream(
         }
 
     finally:
-        # Cleanup temp directory
+        # Cleanup temp directory and streaming directory
         import shutil
         if work_dir.exists():
             shutil.rmtree(work_dir, ignore_errors=True)
+        if stream_dir.exists():
+            shutil.rmtree(stream_dir, ignore_errors=True)