Add @zunialab/mcp, and point the READMEs at the public relay

[danbaruka]

What changes

• New package @zunialab/mcp 0.1.0. An MCP server for coding assistants, over stdio and stateless Streamable HTTP (MCP SDK v2). It serves clients on the 2026-07-28 protocol and 2025-era clients alike.
  • It answers from the published docs (docs-index.json, written by every docs build), npm and the Zunia chain registry, read when asked. Nothing is bundled, so an answer is never older than what is published.
  • 12 read-only tools: search_docs, get_doc, list_docs, list_integrations, get_integration_guide, get_sdk_packages, get_chain, check_address, explain_error, verify_sign_in, ibc_denom, build_forward_memo.
  • The last four run the SDK's own explainZuniaError, verifySignIn, ibcDenomHash and buildForwardMemo, so answers match the shipped packages.
  • Docs pages are served as resources, plus one prompt, integrate_zunia.
• READMEs. api.zunialab.com is open to any site: CORS is open on /v1/connect/, and Zunia mobile store builds trust only that relay. The examples now use it instead of telling dApps to run their own. The MCP package is listed.
• Release checks. scripts/pack.mjs and smoke-tarballs.mjs now cover the new package. The smoke test installs the packed tarball and talks to its bin over stdio.

After merge

• The redeploy timer rebuilds zunia-sdk on the server. With the zunia-infra PR merged, zunia-mcp.service serves https://docs.zunialab.com/mcp.
• Publish to npm: 0.1.1 of sdk-core, sdk-web, sdk-react and interchain (npm still has 0.1.0), plus @zunialab/mcp 0.1.0. Then tag v0.1.1.

Checks run

• pnpm build, typecheck and test pass: 720 tests (interchain 543, core 91, web 44, mcp 37, react 5).
• check:packages passes (publint, attw), and so does smoke:tarballs (Node, Vite, and the MCP bin over stdio).
• The MCP was tested end to end with the official v2 client:
  • over HTTP and stdio, on both protocol generations;
  • against the real docs build and live npm/GitHub;
  • behind the production nginx config, in a container.

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