Tasks

• Red/green: headless clear_history; rendered cursors from before it are dropped.
• Red/green: pane.clear through the output stream under a per-pane output lock.
• Red/green: pane.wait_for_output (substring, regex, rendered cursor, timeout, exit).
• CLI pane wait-output and pane clear; docs/08.
• Mutation-check; scripts/verify.sh full.
• Gemini review (read-only); resolve findings.
• Publish, link and merge on exact-head CI.