The Pi Agent dockerfile templates created ~/.tmux.conf with a literal
\n because the RUN command used single-quoted echo. Tmux never parsed
the malformed line, so mouse mode stayed off. Without tmux mouse mode,
mouse-wheel events in xterm.js fell back to Up/Down arrow keys and
cycled shell command history instead of scrolling the terminal buffer.
- Use printf '%s\n' to write real newlines in .tmux.conf.
- Apply the same fix to the ranger rc.conf where the same bug existed.
- Update tool-images/pi-agent.dockerfile and both affected alembic
migration dockerfile strings.
Quality gates: npm run typecheck, npm run lint, npm test -- --run (87 passed),
py_compile on changed migrations.
Refs: openspec/changes/fix-tmux-mouse-config
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