Fix log noise on Linux devices without WiFi: dynamic interface discovery in MachineInfoProvider

[Copilot]

On Linux machines without a wireless NIC, MachineInfoProvider.Refresh() unconditionally spawned iw dev wlan0 link on every heartbeat, causing command failed: No such device (-19) to flood logs via inherited stderr.

Changes

• Dynamic wireless interface discovery (MachineInfoProvider.cs): Replace hardcoded wlan0 with NetworkInterface.GetAllNetworkInterfaces() filtered to Wireless80211 + Up. When no wireless interfaces exist the list is empty, the loop is skipped entirely, and iw is never spawned. Also supports non-standard names (wlp2s0, wlan1, etc.) and multiple interfaces.

// Before
var rs = Execute("iw", "dev wlan0 link", 1_000);

// After
var wirelessInterfaces = NetworkInterface.GetAllNetworkInterfaces()
    .Where(e => e.NetworkInterfaceType == NetworkInterfaceType.Wireless80211
                && e.OperationalStatus == OperationalStatus.Up)
    .Select(e => e.Name)
    .ToList();

foreach (var ifName in wirelessInterfaces)
{
    var linkOutput = Execute("iw", $"dev {ifName} link", 1_000);
    // ... parse SSID / signal, break on first non-zero signal
}

• Redirect stderr (Execute helper): Enable RedirectStandardError = true so any residual child-process stderr is captured rather than inherited by the StarAgent process.

[Copilot]

Pull request overview

This PR reduces log noise and unnecessary process spawning on Linux devices without WiFi by discovering wireless interfaces dynamically (instead of hardcoding wlan0) and by redirecting child-process stderr to prevent it from being inherited by the agent process.

Changes:

• Discover wireless interfaces at runtime via NetworkInterface.GetAllNetworkInterfaces() and query iw dev <if> link only for matching interfaces.
• Enable RedirectStandardError = true in the Execute helper to avoid stderr leaking into parent logs.

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