MCP server package for AI-agent integration

Shipped @zera-sdk/mcp — a Model Context Protocol server that exposes the SDK's note/commitment/nullifier API as a JSON-RPC tool surface. AI agents (Claude, GPT, etc.) can now mintNote , transferShielded , verifyProof directly without learning the wire format. Asymmetric tool surface design: the MCP exposes only read + simulate by default. Mutating calls require an explicit --allow-mutations flag…