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* fix(stack-files): guard download stream destroy against the supertest in-process close race The download metric was still booking the occasional request as a failure even after PR #1220 moved tracking off res.{finish,close} and onto stream.{end,close}. The remaining race lives one level up: under the in-process supertest transport, req.on("close") can fire as soon as the test consumes the response, before the readable's own end/close pair has been dispatched. The unconditional req.on("close", () => result.stream.destroy()) line forced the readable into a close-without-end state every time that happened. The close handler then booked a failure even though the pipe had delivered every byte. Two layers of defense: - req.on("close") now only destroys the stream while the response is still in flight. If res.writableEnded is already true the pipe has finished and the readable will end on its own; there is nothing to clean up and no synthetic close to provoke. - stream.on("close") falls back to recording success when the response was already fully written. Real disconnects keep recording a failure because res.writableEnded stays false in that case. The semantic stays unchanged: success means the server finished reading the file off disk and pushed it into the pipe. The fix removes the spurious failure path without weakening the disconnect-detection. * chore(stack-files): temporary download diagnostic for the metric race Logs the event order and response state at each handler so the next CI run shows whether req-close fires before stream-end, what res.writable / writableEnded / writableFinished evaluate to at that moment, and which path actually records the failure. Will be removed in the follow-up commit once the race is understood. * chore(stack-files): remove temporary download diagnostic Diagnostic captured the happy-path event order in the previous CI run; removing it now to isolate whether the fix alone is sufficient.