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J. Nick Koston
09fe59c5cc
mDNS on ESP8266/RP2040 always runs over a network interface (WiFi on ESP8266; WiFi or W5500/etc. ethernet on RP2040), and every such interface already publishes an IP state listener in tree. USE_MDNS_EVENT_DRIVEN_POLLING is therefore always defined in production, so the fallback set_interval() paths in both platform files and the was_connected_ bookkeeping are dead code. Also drop the ethernet-specific test — the existing wifi and ethernet+mdns combos are already covered by the mdns test fixtures paired with their network component tests. Trim redundant comments throughout: the header now documents the ~9s probe/announce window and why update() can stop afterward in a few lines instead of a full essay; platform files keep only the non-obvious bits (why RP2040 needs to drive begin()/notifyAPChange() itself, why re-arming on any listener notification is correct).
