Read body stream on post requests for `service-worker`

Editor assessment

The subject states the fix precisely — body streams are read on POST requests for the `service-worker` target — so the header communicates the change, its method, and its area without the diff, and fix(nitro) classifies it correctly. Hygiene is clean: imperative mood, no trailing period, sensible length, no ticket junk. No body is present, tolerable for a contained request-handling fix, and no footer is required. A line on the failure when the stream was unread would add value; the message is already clear, accurate, and publishable in the good band.