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/project/project.go

@@ -0,0 +1,7 @@
+package project
+
+// Project is a lightweight workspace identified by a directory name.
+type Project struct {
+	ID   string `json:"id"`
+	Name string `json:"name"`
+}