com.apple.developer.devicecheck.appattest-environment was hardcoded to
"development" for every build, including the App Store/TestFlight
distribution build. Apple's App Attest servers validate this claim
against how the app was actually signed/distributed, so a "development"
claim on a real distribution build fails - guest session handshake
never gets past the challenge step, no store/city data ever loads.
Parameterized per configuration: development for Debug, production for
Release, via an APP_ATTEST_ENVIRONMENT build setting.
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