MANUAL RUN: Park Hide & Seek offline in the iOS simulator (spike for #2897) #2908

Rough time: 10 minutes, on a Mac with full Xcode. From the spike in the PR for #2897 (branch office/byte-aeb9).

1. brew install xcodegen, then cd apps/park-hide-seek/ios && xcodegen && open ParkHideSeek.xcodeproj. It runs bun scripts/offline.ts before building.
2. Run on an iPhone simulator, turn on airplane mode, type a name, tap Play offline against AI.
3. Check a round runs drop, hide, hunt, results against the AIs, that the thumbstick, Run and Crouch work, and that terrain and people draw.
4. Write down: frame rate, one tick's cost (Instruments), app size, anything that felt bad. Reply here or on the PR.

Nothing in the Swift under ios/App has been compiled yet (the agent's Mac has no Xcode); a compile error there is the likeliest finding.