docs and plans

fix: place homebrew formula in Formula/ directory

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

feat: add prompt analytics, rename Fun Stats to Totals, improve layout

Parse prompt text from history.jsonl display field and compute word
frequencies (top 5), avg prompt length, and p95 prompt length. Rename
"Fun Stats" section to "Totals" and move Models to the left pane. Add
thin horizontal rules between left-pane sections and a vertical
separator between columns for better visual anchoring.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>