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Adds a BioContextAI Registry-compatible MCP server that exposes dataset search and download from CellxGene Discover so any MCP-capable agent (Claude Desktop, Cursor, mcp-cli + Ollama, ...) can fetch single-cell datasets by disease, tissue, or ontology term. The server complements (instead of duplicating) the existing MaxMLang/cxg-census-mcp and biocontext-ai/anndata-mcp registry servers. - New src/patpy/mcp/ package with a multi-source plugin architecture (DataSource protocol) and a CellxGene Discover REST source with pagination, retries, 24 h on-disk index cache, and streaming download with SHA-256 verification. - New mcp/ directory with a schema-validated meta.yaml ready to be PR'd into biocontext-ai/registry, plus a Dockerfile and .dockerignore. - Documentation in docs/mcp.md (linked from docs/index.md and a new section in README.md) covering install, agent config snippets, and a chaining recipe with cxg-census-mcp and anndata-mcp. - Test suite under tests/: server tool registration check, twelve discover-client unit tests with a hand-rolled fake session, and registry-schema validation against the upstream schema.json (committed offline as a fixture). Co-authored-by: Cursor <cursoragent@cursor.com>
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