The auth test server helper and no-dns-rebinding-protection example
reused a single Server instance across requests, calling connect()
on each new transport. SDK v1.26.0's security fix (GHSA-345p-7cg4-v4c7)
now throws "Already connected to a transport" in this case.
Fix by wrapping Server creation in a factory function called per
request, matching the pattern already used by tools_call.ts and
everything-server.ts.
Also updates no-dns-rebinding-protection.ts to use registerTool()
instead of the deprecated tool() API.
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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