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>

internal/ticket/editfile_test.go

@@ -0,0 +1,45 @@
+package ticket_test
+
+import (
+	"strings"
+	"testing"
+
+	"task/internal/ticket"
+)
+
+func TestFormatAndParseEditDocument(t *testing.T) {
+	doc := ticket.FormatEditDocument(ticket.Ticket{
+		Title:       "Fix login",
+		Description: "Steps:\n\n1. repro\n2. patch",
+	})
+	if !strings.HasPrefix(doc, "# Fix login\n") {
+		t.Fatalf("format = %q", doc)
+	}
+
+	title, desc, err := ticket.ParseEditDocument(doc)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if title != "Fix login" {
+		t.Fatalf("title = %q", title)
+	}
+	if desc != "Steps:\n\n1. repro\n2. patch" {
+		t.Fatalf("desc = %q", desc)
+	}
+}
+
+func TestParseEditDocumentPlainTitle(t *testing.T) {
+	title, desc, err := ticket.ParseEditDocument("Plain title\n\nBody text")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if title != "Plain title" || desc != "Body text" {
+		t.Fatalf("got %q / %q", title, desc)
+	}
+}
+
+func TestParseEditDocumentEmpty(t *testing.T) {
+	if _, _, err := ticket.ParseEditDocument("   "); err == nil {
+		t.Fatal("expected error")
+	}
+}