- build.gradle.kts: use maxOf(flutter.minSdkVersion, 23) to preserve
the floor required by oauth2_client/flutter_web_auth_2
- DEVELOPER.md: replace hardcoded /opt/homebrew paths with
$(brew --prefix) for Intel Mac compatibility, use $HOME instead
of /Users/$USER for --sdk_root
- README.md: label quick-start as macOS-specific, add cross-platform
pointer to DEVELOPER.md
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Replaces the vague "Latest stable version" prerequisites in DEVELOPER.md
with concrete commands tested on a fresh macOS machine. Adds Android SDK
setup without Android Studio, documents the gen_icons_splashes.sh
requirement, and fixes the OAuth2 config to reference build_keys.conf
instead of the removed keys.dart.example. Also includes Flutter SDK
auto-migrations (iOS 13.0 min, gradle minSdk).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
