fix(streamable-http): reject duplicate request IDs#2756
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Fixes #2655.
When a Streamable HTTP session receives a second JSON-RPC request with an id that is already in-flight, the transport used to overwrite the per-id stream slot, leaving the first request hanging until client timeout.
This change rejects the duplicate with HTTP 409 + JSON-RPC error (preserving the offending id) and leaves the original request untouched.
Tests: