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Check page receipt uniqueness at the SDK workflow boundary before recording observations. A duplicate-ID injection over real MCP succeeds before the fix and fails after it without writing an answer; an unmodified real reply remains valid. Keep original measurements and production defaults unchanged. Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com> Co-authored-by: Kaoru0822 <208281322+kaoru0822-kitauji@users.noreply.github.com>