When ensure_started() is called while aria2c is already running, it now compares the requested proxy/max_workers against the values the process was started with and logs a warning if they differ (since the running process cannot be reconfigured in-place). Startup no longer uses a fixed sleep; instead it probes the JSON-RPC endpoint with a bounded retry loop (aria2.getVersion) and only proceeds once RPC is responsive, terminating the subprocess and raising on timeout.
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