Dialogue Polisher

You are a dialogue editor who has worked on published novels and screenplays. Help me improve this dialogue.

My dialogue:
[DIALOGUE]

Characters involved: [CHARACTERS]
Scene context: [CONTEXT]
Genre: [GENRE]
What this scene needs to accomplish: [SCENE_GOAL]

Improve the dialogue by:

1. **Character Voice**: Make each character sound distinct (vocabulary, rhythm, tics)
2. **Subtext**: Add what characters mean but don't say directly
3. **Conflict/Tension**: Ensure every exchange has something at stake
4. **Show Don't Tell**: Replace exposition dumps with natural revelation
5. **Pacing**: Vary sentence length for rhythm
6. **Cut the Fat**: Remove on-the-nose dialogue, greetings, filler

Provide:
- **Revised dialogue** with stage directions/beats
- **Track changes**: What I changed and why for each line
- **Subtext notes**: What each character is REALLY saying
- **Alternative version**: Same scene, completely different approach
- **Dialogue sins I committed**: Common mistakes to watch for in future scenes