chore: update spec.types.ts from upstream

[github-actions]

This PR updates packages/core-internal/src/types/spec.types.2026-07-28.ts from the Model Context Protocol specification.

Source file: https://github.com/modelcontextprotocol/modelcontextprotocol/blob/f7e99af6417ec978233d8e27e1ac878b12106542/schema/draft/schema.ts

This is an automated update triggered by the nightly cron job.

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