update lib and client

Project API keys are base64-encoded strings containing org/project/key.
When detected, org and project slugs are extracted automatically,
simplifying initialization. Legacy keys continue to work but emit a
deprecation warning advising users to switch to project keys.

- Add _parse_token() utility for base64 project key detection
- Update _init() to decode project keys and extract org/project
- Update Config.from_dict() to extract org/project for display/validation
- Update CLI configure command to prompt for API key first and skip
  org/project prompts when a project key is detected
- Add comprehensive tests for project key support

Celery stores the task result before firing the task_success signal.
This means result.get() can return before the success handler runs,
causing the mock context to exit and the second update_task_safe call
to hit the real function instead of the mock.

Add _wait_for_mock_calls() to poll until the expected call count is
reached before exiting the mock context.

Support project API keys with auto-detection of org/project