Add offline-first task-master TUI with tickets, board lists, and undo.

Charm-based CLI with JSON persistence, status/list filters, external editor editing, command-history undo/redo, and glamour markdown without AutoStyle OSC hangs.

Co-authored-by: Cursor <cursoragent@cursor.com>

cmd/task-master/main.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	tea "github.com/charmbracelet/bubbletea"
+
+	"task/internal/command"
+	"task/internal/config"
+	"task/internal/project"
+	"task/internal/ticket"
+	"task/internal/ui"
+	"task/internal/version"
+)
+
+func main() {
+	if len(os.Args) > 1 {
+		switch os.Args[1] {
+		case "version", "--version", "-v":
+			fmt.Printf("%s  %s\n", config.AppName, version.BuildVersion)
+			return
+		case "help", "--help", "-h":
+			printHelp()
+			return
+		default:
+			fmt.Fprintf(os.Stderr, "unknown command: %s\n", os.Args[1])
+			printHelp()
+			os.Exit(1)
+		}
+	}
+
+	if err := run(); err != nil {
+		fmt.Fprintf(os.Stderr, "error: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func run() error {
+	cfg, err := config.LoadOrCreate()
+	if err != nil {
+		return fmt.Errorf("config: %w", err)
+	}
+
+	store := ticket.NewJSONStore(cfg.DataDir)
+	projects := project.NewDirStore(cfg.DataDir)
+	if err := projects.Ensure(cfg.ActiveProject); err != nil {
+		return fmt.Errorf("ensure project: %w", err)
+	}
+
+	history := command.NewHistory()
+	model := ui.New(cfg, store, projects, history)
+	prog := tea.NewProgram(model, tea.WithAltScreen())
+	if _, err := prog.Run(); err != nil {
+		return fmt.Errorf("tui: %w", err)
+	}
+	return nil
+}
+
+func printHelp() {
+	fmt.Printf(`%s — offline-first terminal task manager
+
+Usage:
+  %s           Start the TUI
+  %s version   Print build version
+  %s help      Show this help
+
+`, config.AppName, config.AppName, config.AppName, config.AppName)
+}