Jude GaoandGitHub 3547ef6715 docs: update MCP guides for the thin next-devtools-mcp (#94859)
Updates the Next.js docs that describe `next-devtools-mcp` to match its
0.4.0 thin-connector shape (see vercel/next-devtools-mcp#145). The
knowledge-base, migration/upgrade, and Cache Components tools are gone —
docs now ship with Next.js in `node_modules/next/dist/docs/` and
upgrades use the codemod — so the guides should no longer point agents
at those tools.

In the MCP guide (`mcp.mdx`), the Development Tools list drops
"Knowledge Base", "Migration and Upgrade Tools", and "Caching Guide" in
favor of a documentation gateway that points agents at the bundled docs,
and the examples now describe reading bundled docs and running the
codemod rather than querying a knowledge base. In the v16 upgrade guide,
the "Using AI Agents with Next.js DevTools MCP" section no longer
instructs users to run removed prompts (`Next Devtools, help me upgrade`
/ `migrate to cache components`); it points to the codemod plus runtime
diagnostics.

Should land with the next-devtools-mcp 0.4.0 release.

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Next.js

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Used by some of the world's largest companies, Next.js enables you to create full-stack web applications by extending the latest React features, and integrating powerful Rust-based JavaScript tooling for the fastest builds.

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