* feat(gain): add colored dashboard with efficiency meter and impact bars
Upgrade `rtk gain` output with rich terminal visualization:
- Colored percentage cells (green ≥70%, yellow ≥40%, red <40%)
- Efficiency meter: ASCII progress bar with savings percentage
- Impact bars: proportional block charts per command
- Styled section headers (bold green)
- Command names in bright cyan
- History tier indicators (▲/■/•)
- Dynamic column widths for clean table alignment
- KPI-style key-value layout for summary metrics
All visual features are TTY-aware via std::io::IsTerminal — output
degrades gracefully to plain text when piped or redirected.
No new dependencies (uses existing `colored` crate).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* Add dashboard visualization screenshot
Shows colored terminal output of `rtk gain -p` with:
- Project-scoped token savings header
- Efficiency meter with color gradient
- Per-command table with colored Avg% and Impact bars
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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