* Fix auto-lookback trigger and add version tracking
- Trigger on stdin inactivity instead of render time
- Only dump when new output exists since last dump
- Default timeout 5s -> 15s
- Embed git hash in version output
- Document macOS config path
* feat: add auto lookback mode
Automatically shows full terminal history after idle timeout,
returns to truncated view when new output arrives.
- Add auto_lookback_timeout_ms config option (default: 1000ms)
- Add --auto-lookback-timeout CLI flag
- Set to 0 to disable the feature
* intermediate
* auto lookback
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Co-authored-by: Ilya Sinkin <ilyasinkin2002@yandex.kz>