Request ids above 2^53 are answered with a different id #271

JSON-RPC ids are parsed with JSON.parse, so a numeric id above Number.MAX_SAFE_INTEGER loses precision and the response carries a different id. basic.md: "Result responses MUST include the same ID as the request they correspond to."

Repro

{"jsonrpc":"2.0","id":9007199254740993,"method":"tools/list"} → response "id":9007199254740992, status 200.

Suggested fix

Refuse numeric ids that are not safe integers with -32600 (simplest), or keep the raw id text.

Found during the round-7 review of #170; also on main.

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