feat: meatquest ip discovery vis mDNS - #19
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No more hard-coded QUEST_IP. The Quest sender (paired Unity commit)
now advertises ``_syncfield-quest._tcp`` via Android NsdManager, and
the Mac recorder finds it via zeroconf — same protocol AirPlay /
AirPrint / Chromecast use, so it works on any network that passes
multicast DNS (most home / office WiFi).
Resolution order in ``discover_quest_ip()``:
1. ``QUEST_IP`` env var — explicit override (multi-Quest, CI, the
rare network that filters both mDNS and broadcast).
2. Cached IP, validated by a 1.5 s ``/status`` probe. Stable
networks re-resolve in <1 s after the first success.
3. mDNS browse (~5 s budget). Primary path on fresh networks /
after a DHCP renewal.
4. UDP :14044 broadcast listener — last-resort for networks with
multicast DNS disabled.
Measured on the current network:
* Cache hit: 0.23 s
* Fresh mDNS (warm): 0.46 s
* Stale cache → mDNS: 2.09 s
record.py drops the QUEST_IP constant entirely. User runs it on any
subnet + the Quest app takes care of advertising; the Mac side never
needs to see an IP in human eyes.
``zeroconf`` moves into the ``camera`` extra so the example's
documented ``syncfield[ble,viewer,camera]`` install pulls it in
automatically.
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
styu12
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