[mattpodwysocki]

Bumps @modelcontextprotocol/server, /core and /client from 2.3.1 to 2.4.0, and /node to 2.1.2. Follow-up to #296.

Why

2.4.0 adds the SDK's Skills extension (SEP-2640, typescript-sdk#3047) under @modelcontextprotocol/server/ext/skills. #295 can switch its hand-rolled skills/list and skills/get to SkillsExtension once this is in. The sibling repos (devkit, docs, figma, hosted) are moving to 2.4.0 at the same time so hosted can pin one version.

Patch changes checked

• fast-uri now rejects some $id/$ref forms (#3083), and an object $ref root output schema no longer gets the { result } wrapper (#3081). None of our schemas use $id, .meta({ id }) or a $ref root.
• x-mcp-header on number params is rejected (#2762, #2960). We don't use x-mcp-header.

Testing

• Build passes, 96 files / 1083 tests pass, lint 0 errors.
• Built server over stdio: negotiates 2025-11-25, lists 30 tools and 3 resources.

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