better_internet_connectivity_checker 0.0.1

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• InternetConnection scheduler with checkOnce() and a de-duped broadcast onStatusChange stream; sealed InternetStatus (Reachable with response time + ConnectionQuality, Unreachable with failed-probe diagnostics); slow-connection detection opt-in via slowThreshold.
• Pluggable ConnectivityProbe interface with default HttpHeadProbe (HTTP HEAD, shared http.Client, per-target timeout); DNS / TCP / retry-decorator / mock transports drop in via constructor injection.
• Pluggable ReachabilityPolicy interface with AnyReachablePolicy (default, any-of-N race) and AllReachablePolicy (strict, all-of-N); per-policy slow classification — winning probe under any-of-N, the slowest successful probe under all-of-N.
• Sibling-probe cancellation via http.AbortableRequest: under any-of-N, in-flight probes abort at the transport layer the moment one succeeds, releasing sockets immediately instead of waiting out the per-target timeout.
• an externalRecheckTrigger constructor hook forces an immediate recheck on any Stream