- `render_cinematic_to_file` referenced undefined `stdout`/`stderr` in the
Blender error path; replaced with `log_lines`/`stderr_lines` so the real
Blender error is actually stored in render_log instead of a Python NameError
- Progress callback hardcoded 480 frames; now uses the `frame_count` variable
- Updated docstring to reflect actual 250 frames @ 25fps (not 480 @ 24fps)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>