Fixes#76815.
- Teach the Swift macOS identity store to load TypeScript PEM identity files without regenerating device IDs.
- Teach the TypeScript identity store to migrate legacy Swift raw-key identities to PEM after validating key material.
- Preserve recognized invalid identity files instead of clobbering them, preventing repeated pairing churn while retaining diagnostic evidence.
- Align the macOS wizard CLI with the generated protocol model.
Reported by @aboundTechOlogy.
Thanks @BunsDev.