Release v1.4.0

Added

• SAM3-based video object tracking, per-event VLM captioning, serialized SAM3 outputs, an example
  event pipeline, and a demo tool.
• Sensor library support for GPS, IMU, camera intrinsics, and camera extrinsics data.
• MP4 header validation utilities for video-index checks.
• Qwen3.5-27B support for image captioning.
• External OpenAI/Gemini endpoint support for image semantic filtering and classification stages.
• Async OpenAI/Gemini request handling with batch_size-controlled concurrency for image/video
  captioning and external filter/classifier stages.
• exclusive_end_ns support in make_ts_grid for half-open clip spans.

Fixed

• Prevent Qwen from falling back to native-resolution inputs during resize.
• Isolate vLLM async per-window payload handling.
• Preserve model-variant-specific image filter errors.

Changed

• Upgrade the cosmos-xenna Python package and submodule to v0.4.0.
• Add a dedicated sam3 pixi environment for Segment Anything 3 dependencies.
• Include runtime prompt and config data files in built wheels.

Documentation

• Reorganize curator documentation into design, guide, and reference sections.
• Add the interactive Slurm guide.
• Add GPS and IMU sensor-library design documentation.
• Update image pipeline documentation, including Qwen3.5 coverage.