- Add bubbletea and bubbles dependencies
- Create internal/tui/feed package with:
- model.go: Main bubbletea model with agent tree and event stream
- view.go: Rendering logic with lipgloss styling
- keys.go: Vim-style key bindings (j/k, tab, /, q)
- styles.go: Color palette and component styles
- events.go: Event source from bd activity
- Update gt feed to use TUI by default (--plain for text mode)
- TUI features: agent tree by role, event stream, keyboard nav
Closes gt-be0as, gt-lexye, gt-1uhmj
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>