Add rounded-display-corner support for affected Apple Watch models

[Copilot]

Several Apple Watch models with edge-to-edge displays were not reporting hasRoundedDisplayCorners == true. This updates watch capability metadata so the affected Series, SE, and Ultra models are classified consistently.

• watchOS rounded-corner capability

  • adds a watchOS-specific allDevicesWithRoundedDisplayCorners
  • exposes hasRoundedDisplayCorners for watch models using the same real-device/simulator behavior as other capability checks

• Apple Watch model metadata

  • marks the affected models as having rounded display corners in the generator source
  • updates the generated device definitions to include:
    • Series 4–11 models listed in the issue
    • SE (2nd generation) 40mm/44mm
    • Ultra / Ultra 2 / Ultra 3

• focused regression coverage

  • adds a watchOS test that asserts the expected rounded-corner set across all real watch devices

public static var allDevicesWithRoundedDisplayCorners: [Device] {
  return [
    .appleWatchSeries4_40mm,
    .appleWatchSeries4_44mm,
    // ...
    .appleWatchUltra3,
    .appleWatchSeries11_42mm,
    .appleWatchSeries11_46mm,
  ]
}