Add policy lookup skill for benefit/tax amount questions

[MaxGhenis]

Summary

• Adds a new policyengine-policy-lookup skill that triggers on factual policy questions like "what is the TANF benefit for a single parent with 2 kids in Arkansas?"
• Previously these questions fell through to web search because no skill description matched "what is", "how much", "max benefit", etc.
• The skill teaches the simulation approach: create a household, calculate the variable, get the answer
• Registered in essential, analysis-tools, and complete plugins

Why a new skill vs modifying existing ones

The existing policyengine-us-skill is about building simulations for analysis. This skill is about answering factual questions — different intent, different trigger words, different patterns. Keeping them separate avoids bloating the calculation skill.

What the skill covers

• Quick pattern for "what benefit does this household get?"
• Key program variable name table (TANF, SNAP, EITC, CTC, etc.)
• Getting maximum benefit amounts (zero-income household)
• State comparison pattern
• TANF state coverage list
• Varying family size
• Discovering available variables
• Troubleshooting when results are 0

Test plan

• Verify skill appears in Claude Code skill list after plugin update
• Test that asking "what is the TANF benefit for a single parent with 2 kids in CA?" triggers the skill
• Verify the Python examples in the skill actually work

🤖 Generated with Claude Code