Fix/watchdog protocol detection#13
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zt status previously showed a static "auto" for tunnels not pinned to a specific protocol, even though cloudflared negotiates and can fall back at runtime (startup connectivity pre-check, or mid-session fallback). Add internal/cloudflared.DetectEffectiveProtocol, which tails a tunnel's cloudflared.log for the 'Registered tunnel connection ... protocol=' and 'precheck complete ... suggested_protocol=' markers and returns whichever is chronologically most recent. zt status now shows 'auto (http2)' / 'auto (quic)' instead of a bare 'auto'. Also documents the separate 502-despite-healthy-QUIC case (UDP MTU/ fragmentation dropping real traffic while the pre-check's small test connection still passes) - not detectable or fixable automatically, --tcp is the only fix.
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