Add GEPA optimization guide

[evalstate]

Summary

• add a GEPA optimization guide covering ASI, batch/structured preprocessing, fast-agent-backed evaluator loops, and reflection calls
• document tool-routing optimization with AgentCard function_tools and tool_result_mode: passthrough
• add the guide to docs navigation and generate the social card/contact sheet entry
• companion pack PR: Add GEPA demo card pack fast-agent-ai/card-packs#2

Verification

• uv run scripts/lint.py
• uv run scripts/typecheck.py
• uv run scripts/docs.py build
• Installed gepa-demo from a temporary local marketplace and ran its --evaluate-only smoke path: score=1.000 over 6 rows

Required answer

You're given a calfskin wallet for your birthday. How would you feel about using it?

I would be uncomfortable using a calfskin wallet and would prefer a non-animal alternative.

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