v3.25.3

• Fix: per-request singleton state leakage in worker mode by @techmahedy in #275
• Fix: Normalize the error paths onto real Response objects by @techmahedy in #276
• Fix: Stop using the shared singleton response object as the mutable envelope for route results by @techmahedy in #277
• Fix: Make JsonResponse use a single response body source by @techmahedy in #278
• Fix: Make Response body contract explicitly nullable by @techmahedy in #279
• Harden response lifecycle consistency and add lifecycle regression coverage by @techmahedy in #280
• Deleted InteractsWithInsightErrorTracking after changing error lifecyle by @techmahedy in #281