feat: TUI split-pane layout with ratatui dashboard
Replace web dashboard with ratatui + crossterm + tui-textarea TUI:
- Left pane: scrollable conversation + input area with cursor indicator
- Right pane: live dashboard (model, tokens, context gauge, LSP, team, session)
- Auto-activates when stdout is a terminal, falls back to rustyline REPL
- Suspend/resume pattern: TUI suspends for run_turn (normal stdout), resumes after
- Key bindings: Enter/Shift+Enter, Ctrl+P/T/C/D, Tab completions, PageUp/Down
- 16ms poll interval with dirty-flag optimization
- CLAW ASCII art banner in styled colors
Dependencies added: ratatui 0.29, tui-textarea 0.7
💘 Generated with Crush
Assisted-by: GLM 5.1 FP8 via Crush <crush@charm.land>
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