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>

cmd/dashboard/main.go

@@ -0,0 +1,85 @@
+// Command dashboard provides an interactive TUI for managing bot agents.
+//
+// Usage:
+//
+//	dashboard           # launch the interactive TUI
+//	go run ./cmd/dashboard
+package main
+
+import (
+	"fmt"
+	"os"
+
+	tea "github.com/charmbracelet/bubbletea"
+
+	puretui "github.com/enmanuel/agents/pkg/tui"
+	"github.com/enmanuel/agents/shell/process"
+	shelltui "github.com/enmanuel/agents/shell/tui"
+)
+
+const (
+	runDir     = "run"
+	agentsGlob = "agents/*/config.yaml"
+)
+
+func main() {
+	_ = os.MkdirAll(runDir, 0o755)
+
+	mgr := process.NewManager(runDir, agentsGlob, "")
+	adapter := shelltui.NewAdapter(mgr)
+
+	p := tea.NewProgram(newBridge(adapter), tea.WithAltScreen())
+	if _, err := p.Run(); err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+// bridge implements tea.Model and connects the pure Update with the impure Adapter.
+type bridge struct {
+	model   puretui.Model
+	adapter *shelltui.Adapter
+}
+
+func newBridge(adapter *shelltui.Adapter) bridge {
+	return bridge{
+		model:   puretui.InitialModel(),
+		adapter: adapter,
+	}
+}
+
+func (b bridge) Init() tea.Cmd {
+	return b.adapter.RunIntent(puretui.Intent{Kind: puretui.IntentLoadAgents})
+}
+
+func (b bridge) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
+	// Convert tea messages to pure messages.
+	var pureMsg interface{}
+	switch m := msg.(type) {
+	case tea.KeyMsg:
+		pureMsg = puretui.KeyMsg{Str: m.String()}
+	case tea.WindowSizeMsg:
+		pureMsg = puretui.WindowSizeMsg{Width: m.Width, Height: m.Height}
+	default:
+		// MsgAgentsLoaded, MsgActionDone, MsgLogsLoaded, MsgTick pass through.
+		pureMsg = msg
+	}
+
+	// Pure update: no side effects.
+	newModel, intents := puretui.Update(b.model, pureMsg)
+	b.model = newModel
+
+	// Convert pure intents to impure tea.Cmds.
+	cmds := make([]tea.Cmd, 0, len(intents))
+	for _, intent := range intents {
+		if cmd := b.adapter.RunIntent(intent); cmd != nil {
+			cmds = append(cmds, cmd)
+		}
+	}
+
+	return b, tea.Batch(cmds...)
+}
+
+func (b bridge) View() string {
+	return puretui.View(b.model)
+}