Summary

• Renamed from "Rapid Prototyping" to "Prototyping for Agent-First Apps"
• Reframed around agent-first philosophy: prototype the agent first, then expand to tools, then the app shell
• Added standalone context: Perstack/Expert/Runtime explanation, prerequisites, supported providers
• Showcased create-expert CLI as primary prototyping workflow
• Added "Test with real scenarios" section: write deliberate failure cases, validate agent behavior, refine instructions
• Added "Evaluate with others" section: distribute perstack.toml for feedback, use perstack log for analysis
• Removed deep dives into delegation, tools, and app integration (linked instead)
• Kept the guide focused on prototyping, not the full development lifecycle

Test plan

• All internal links resolve to existing files
• TOML snippets are syntactically valid
• npx perstack run works with the guide's example Expert definition (verified with 0.0.82)

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