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[Bug]: MCP server fails to negotiate protocolVersion 2025-11-25 (latest spec) #1778

@SakulaPor

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@SakulaPor

Bug Description

Repro: POST to /mcp with initialize and protocolVersion: "2025-11-25" → 500 / hang. Same request with 2025-06-18 → correct response. Server should downgrade per MCP spec instead of failing.
Impact: Claude Desktop (current version) cannot connect, since it sends 2025-11-25 by default.
Version: TaskNotes 4.5.1, Obsidian on Windows 11

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