docs: add AI-assisted development coloring book script (#7)

Follow-on to the SRE "Reliability Nightmares" coloring book.
Same setting (Gino's restaurant), same characters, new domain.

Five challenges covering core AI-assisted development patterns:
1. Codebase Agent (CBA)
2. Memory System
3. Self-Review Reflection
4. Proactive GHA Workflows
5. Issue-to-PR Automation

Includes page-by-page script, visual direction notes, self-assessment
scoring, and production notes for illustration.

Author: jeremyeder