- Processor _parse_script: accept both [N]: and legacy Speaker N: input
- Processor _process_single: tokenize as [N]: format (1-based)
- Processor _create_voice_prompt: use [N]: prefix for voice prompts
- Node _normalize_roles: convert custom roles and Speaker N: to [N]: format
- Node auto-wrap: plain text becomes [1]: text
- Dialogue node: output [N]: format for batch TTS