XcodeGen fails when project.yml references a missing config file.
Add Signing.local.xcconfig.example and have generate-xcodeproj.sh
copy it on first run so fresh clones can generate the project.
Co-authored-by: Rocky <hkgood@users.noreply.github.com>
Replace MLX GPU inference with CoreML bundles so transcription continues
while the host app is backgrounded. Adds model download and warm-up,
vendored Qwen3Speech, and updates onboarding, settings, and copy for the
~1.6 GB CoreML package (iOS 18+).