v0.13.0

Added

• r3 can actively wake up session to send notifications. r3 listen <id>
  registers the current Claude Code or Codex session and returns. When the
  reviewer submits feedback, approves, or abandons the review, r3 sends a
  notification into that agent session; the agent can then fetch the feedback
  with r3 prompt. Previously, agents must keep an r3 watch long running
  process to receive feedback.
• Session ids are recorded automatically. Reviews and work-in-progress
  badges identify the agent session involved. The UI shows a short id and lets
  you copy the full one, making it easier to find or contact the same session.

Changed

• Large reviews stay steadier while loading and typing. Deferred file cards
  reserve their expected height so the scrollbar does not keep shifting as you
  move through the review, and desktop paint containment roughly halves the
  measured composer-keystroke cost on a 200-file review.
• The agent guide better explains how to use r3. It now starts with which
  kind of review to create and walks through receiving feedback, claiming work,
  replying, and sending another revision.
• Anchoring feedback in scratch reviews is simpler. Agent commands can refer
  to a scratch file by its displayed filename, such as notes.md.

Fixed

• A failed listener hand-off no longer looks successful. The UI reports when
  Submit reached nobody, repeated Submits cannot be deduplicated into silence,
  and stale registrations no longer lock another agent out of the review.
• Marking a rendered Markdown table row keeps its columns aligned. The
  feedback bar no longer inserts an apparent empty cell ahead of the row.