Add validate_and_truncate(), validate_nickname(), validate_message(), validate_poke_message(), validate_channel_name() with length limits. Wire to send_text_message in adapter. 14 new validation tests.
Add validate_and_truncate(), validate_nickname(), validate_message(), validate_poke_message(), validate_channel_name() with length limits. Wire to send_text_message in adapter. 14 new validation tests.