Zig-native mobile: iOS compiles, serves a bridge call on a simulator, and is gated against drift

• 1a0032a995 fix(ios): compile again, and gate it so it stays compiling glennmichael123 review this step
• 346ee1495b refactor(android): delete the JNI layer that could never have worked glennmichael123 review this step
• baf17707cb feat(ios): serve a bridge call from Zig, on a simulator, end to end glennmichael123 review this step
• 57ec139909 test(ios): gate the Swift-to-Zig migration, and stop five promises hanging glennmichael123 review this step
• eb1f76c024 fix(ci): keep the iOS surface gate off Linux, and format what zig fmt wants glennmichael123 review this step