yatd, yet another td

There are many tds. This one is mine.

$ td --help
Todo tracker for AI agents

Usage: td [OPTIONS] <COMMAND>

Commands:
  init     Initialize .td directory
  create   Create a new task [aliases: add]
  list     List tasks [aliases: ls]
  show     Show task details
  update   Update a task
  done     Mark task(s) as closed [aliases: close]
  reopen   Reopen task(s)
  dep      Manage dependencies / blockers
  label    Manage labels
  search   Search tasks by title or description
  ready    Show tasks with no open blockers
  stats    Show task statistics (always JSON)
  compact  Vacuum the database
  export   Export tasks to JSONL (one JSON object per line)
  import   Import tasks from a JSONL file
  help     Print this message or the help of the given subcommand(s)

Options:
  -j, --json     Output JSON
  -h, --help     Print help
  -V, --version  Print version