feat: add bubbletea TUI dashboard for bot server management

Implementa un dashboard interactivo con bubbletea siguiendo el patrón
pure core / impure shell del proyecto:

- pkg/tui/ (PURE): Model, Update, View — solo fmt y strings, cero I/O.
  Update produce Intent[] (datos puros) en vez de side effects.
- shell/tui/ (IMPURE): Adapter convierte Intent[] en tea.Cmd[] con I/O real
  (process management, /proc stats, log tail).
- cmd/dashboard/ (composición): Bridge conecta pure Update con shell Adapter
  usando la Elm Architecture de bubbletea.

Pantallas: Main Menu → Agent List → Agent Actions (start/stop/restart/kill) → Logs.
Navegación: flechas ↑↓, Enter seleccionar, 0 volver, q salir.

Dependencias añadidas: bubbletea, lipgloss.
Actualiza .gitignore para anclar binarios a raíz (/agentctl, /dashboard).
Documenta nuevos scripts en CLAUDE.md.

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

go.sum

@@ -1,15 +1,31 @@
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@@ -37,8 +55,18 @@ github.com/mattn/go-isatty v0.0.19 h1:JITubQf0MOLdlGRuRq+jtsDlekdYPia9ZFsB8h/APP
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