Compatibility

Mobile Surfaces pins to a single tested toolchain row. Treat any cell change as an upgrade ritual: bump deliberately, run pnpm surface:check && pnpm typecheck && pnpm dev:doctor && pnpm mobile:prebuild:ios on a fresh clone, and update this row in the same PR.

Notes:

• expo-build-properties follows Expo SDK majors and is pinned to the SDK 55 line.
• @bacons/apple-targets is pinned to an exact patch because the author publishes from main without release tags; floating ranges have shipped breaking changes.
• The Expo SDK 55 floor for iOS is 15.1, but Mobile Surfaces deliberately targets 17.2 so push-to-start tokens (Activity<…>.pushToStartTokenUpdates) are available without if #available ceremony. Dynamic Island additionally requires an iPhone 14 Pro or newer.
• SDK 55 removes newArchEnabled: false as a togglable option; the New Architecture is mandatory. App Group entitlements and shared-state setup for the multi-surface work in later phases assume the new arch.
• Xcode 26 ships Swift 6.2. App targets default to Approachable Concurrency; SPM packages (including the local Live Activity module) keep strict concurrency opt-in.