Spec conformance: meta support and spec updates#414

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aharvard wants to merge 2 commits intomodelcontextprotocol:mainfrom

aharvard:feat/spec-conformance-_meta-support

Commits on Sep 3, 2025

feat: adopt MCP 2025-06-18 _meta support and set default protocol version; add _meta to content blocks and embedded resource; update schemas
aharvard
committed
chore: update generated JSON Schema snapshots for MCP 2025-06-18 changes
aharvard
committed