Pumpko v1.5.0 source-only corrective patch

1. Existing installations now offer to launch the native setup wizard rather than silently skipping it. Choosing No preserves settings.
2. Wizard asks for BBS domain rather than silently inheriting a default.
3. Native sync logs a missing or incomplete hub\sync.json instead of silently exiting.

IMPORTANT: This is a SOURCE PATCH, NOT a tested Windows release. Build on LinuxMonster with: bash ./build-all.sh --clean --target win32 --jobs 4
Do not enroll against the production Score Hub for a test. Do not reset or remove existing outbox/cursor files.
The diagnostic cannot establish why the server rejects or fails to provide scores; after safe config setup, collect redacted sync logs.
