iOS Simulator Full Reset

When things are really broken, start fresh:

1. Shutdown all simulators:

xcrun simctl shutdown all

2. Clean build artifacts:

make clean
rm -rf ~/Library/Developer/Xcode/DerivedData/Leavn-*

3. Reset simulator (optional - destructive):

# Delete and recreate simulator
xcrun simctl delete [DEVICE_ID]
xcrun simctl create "Leavn Fresh" "iPhone 16 Pro"

4. Fresh build:

make sim-build

5. Install and launch:

make sim-run

Use this when:

• "It works in Xcode but not via make"
• Persistent runtime errors that don't make sense
• Simulator state is corrupted
• Nothing else works

Return status of each step.