feat: LLM Wiki pack

[stebbins]

Before you continue

• I searched existing issues and did not find a duplicate.
• I can explain the user problem this solves, not just the implementation I prefer.

Problem to solve

• Gascity has no knowledge repository pack
• Karpathy's LLM Wiki concept would be a powerful knowledge repository for a city

Proposed change

Example pack with LLM Wiki implementation

Alternatives considered

No response

Scope and impact

No response