v0.24.0: 0.24.0: notes for the agent, editor 0.2.1 (#50)

• Notes for the agent. In oxframe dev (editor 0.2.1), Comment or C marks
  a node or an area of the frame and takes a note; notes are kept in
  out/notes/. oxframe check lists open notes first as review_note
  errors (text, time, node, file:line, a crop of the frame) and exits
  non-zero while any is open. oxframe notes lists them and oxframe notes done <id> --reply "…" closes one; the reply shows up in the editor. MCP
  tools: notes, note_done.
• Editor 0.2.1: ←/→ jump 5 s (Shift: 1 s) and keep the video playing;
  ,/. step a frame (</> ten); dragging the playhead during playback
  plays on from where it is let go.
• Creates projects on oxframe 0.24.0.