Convert collaboration prompt from character names to direct address

- Changed 'Squirrel/Claude' dialogue format to 'You/I' direct address
- Removed introductory note about example names since direct address eliminates need
- Makes guidance feel more immediate and actionable rather than observational
- Eliminates cognitive translation step from example to actual collaboration
- 'I/You' format chosen over 'Me/You' to feel natural for Claude to read and embody

Author: nikomatsakis