Add cityparity MCP server

Cost-of-living and quality-of-life comparison across ~165 cities:
take-home pay, taxes, equivalent salary, and safety-net deltas.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

README.md

@@ -1579,6 +1579,7 @@ Provides direct access to local file systems with configurable permissions. Enab
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