[workers-sdk] [Bug]: Python Worker package upload returns HTTP 500 / 10013, including submission from a hosted Worker

## Observed symptom [Bug]: Python Worker package upload returns HTTP 500 / 10013, including submission from a hosted Worker The full Python Worker package should upload and return a usable version or a specific validation/compilation error. The candidate is below the documented 64 MiB uncompressed bundle limit. Wrangler upload repeatedly fails with `write ECONNRESET`. A fixed-length multipart request reaches the API but returns HTTP 500, error 10013, with the message “An unknown error has occurred.” The API suggests filing a workers-sdk issue or contacting the account team. ## Literal error text ``` python from workers import WorkerEntrypoint, Response class Default(WorkerEntrypoint): async def fetch(self, request): return Response('Commissioning held', status=503) ``` ## Environment GitHub cloudflare/workers-sdk #16007 ## Trigger / context Public GitHub report in cloudflare/workers-sdk (FRESH_7D). ## Source evidence - https://github.com/cloudflare/workers-sdk/issues/16007 (2026-10-01T21:41:58Z) — evidence_class: PRIMARY_ISSUE_REPORT — #16007 ## Freshness - classification: FRESH_7D - retrieved_at: 2026-10-02T10:44:03.802689Z - scout_id: Ccffcc901a2 ## Scout notes This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome. Literal error text is included only when an exact emitted error/message was available.