video-cutter: standalone sentence-aware cutter

When triggered, invoke the video-cutter-agent sub-agent with:

• video_path: path to the source video
• word_timings_path: path to a word-timings JSON, or null (the agent will transcribe with faster-whisper if missing)
• target_cut_points: approximate timestamps in seconds where the user wants cuts
• output_dir: default Team/BenAI/Profiles/Milan/Daily/{today}/cuts/, or user-specified
• section_titles: ordered names for the output clip filenames

If word timings are not provided, the agent will transcribe first. Pass null for word_timings_path to trigger this.

Profile boundary

Output writes to Profiles/Milan/ unless the user specifies otherwise. See [[yt-pipeline SPEC|SPEC.md]].

For the algorithm details, see [[algorithm]]. For QA verification, see [[qa-protocol]].