v1.0.1

feat: add tp task <id> top-level command for better UX

Migrate 'tp get task <task_id>' to direct 'tp task <task_id>' shortcut.
The get task sub-command is kept for backwards compatibility.

- Add task_command.py with top-level 'task' command
- Register in main.py as a top-level command
- Add unit tests (7 new tests, 100% passing)
- Bump version to 1.0.1

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>