ArcBLEKit 0.2.4

What's Changed

• Fix a write-without-response readiness race that could time out after CoreBluetooth had already reported the peripheral as ready.
• Recheck readiness after waiter registration so an early callback cannot be lost.
• Add deterministic regression coverage for the callback timing window.

Validation

• SwiftPM tests: 62/62 passed
• iOS build and DocC passed
• Xcode 27 compatibility passed

Full Changelog: 0.2.3...0.2.4