Will Miao 3a2941d751 fix(aria2): drain stderr pipe to prevent aria2 freeze, retry RPC status on transient failure ...

Root cause: aria2c subprocess stderr pipe (64 KB buffer) was never
drained. When enough error/warning output accumulated, aria2's write()
blocked, freezing the entire process including its RPC handler. The
tellStatus call then timed out after 30s with asyncio.TimeoutError(),
producing the empty error message in 'Failed to query aria2 download
status: '.

Fixes:
- Drain stderr in a background task so pipe never fills up
- Retry get_status() RPC calls up to 3 times on transient failure
- In the failure path, preserve .safetensors when .aria2 is absent
  (the download was likely complete on disk)

2026-06-26 08:25:05 +08:00

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