chore: add missing changeset for @modelcontextprotocol/core

[felixweinberger]

The pending Version Packages release bumps client/server/middleware but not @modelcontextprotocol/core: none of the queued changesets name it, and it bundles core-internal as a devDependency, so changesets has no propagation path. Meanwhile its public surface changed on main (removed RequestMetaEnvelopeSchema; added the SubscriptionFilter/SubscriptionsListen*/SubscriptionsAcknowledged* schema exports).

Without this, the release would publish client/server with new wire behavior while core stays at its previous version with diverged bundled schemas — consumers validating payloads against core would disagree with what client/server of the same release emit.

One changeset declaring the change; the auto-generated release PR regenerates with the core bump included.

How Has This Been Tested?

Changeset-only change. Verified the only prior changeset naming core was already consumed in the previous release (recorded in .changeset/pre.json), and that packages/core/src/index.ts changed on main since that release.

Breaking Changes

None in this PR; the changeset records the already-landed export removal so it reaches the changelog.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

[changeset-bot]

🦋 Changeset detected

Latest commit: dc69813

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@modelcontextprotocol/core	Major

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Click here if you're a maintainer who wants to add another changeset to this PR

[pkg-pr-new]

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@modelcontextprotocol/node

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commit: dc69813