fix: name should be optional among all guide functions

[Ki-Seki]

Fixes #22

[Copilot]

Pull Request Overview

This PR makes the name parameter optional across all guide functions to maintain consistency. It also adds proper validation for the choices parameter in the options method.

• Makes name parameter optional (default None) for person_name, phone_number, e_mail, and single_word methods
• Makes choices parameter optional in options method and adds validation to ensure it's not empty
• Maintains consistent API design across all guide functions

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[Copilot]

Making choices optional with a default of None creates an inconsistent API. The choices parameter is fundamental to the options method's functionality and should remain required. Consider keeping it as choices: list[str] to maintain clarity about required parameters.

Suggested change

	def options(self, name: str | None = None, choices: list[str] | None = None) -> MaskedTag:
	"""Choose one from the given options."""
	if choices is None or len(choices) == 0:
	def options(self, name: str | None = None, choices: list[str]) -> MaskedTag:
	"""Choose one from the given options."""
	if len(choices) == 0: