v0.19.0 — Retro consoles you can drive

First release under the retrokix name (was gbax).

Highlights

• NES support via bundled FCEUmm core — the runtime picks a core
  from the ROM extension; retrokix browse shows a per-row console
  badge and merges both libraries.
• Wikipedia-fame ranking — 10,000+ ROM groups across GBA + NES
  are scored by Wikipedia 12-month pageviews and shown with a 0–5
  star column. Year-of-release category filter rejects franchise hubs
  and shared-name non-games at resolve-time.
• gbax → retrokix rename — old GitHub URLs auto-redirect; the
  gbax PyPI project is yanked.

Upgrade path

```
pip install retrokix
```

The CLI binary is now `retrokix` (was `gbax`). The env var that
points at a custom libretro core is now `RETROKIX_CORE_PATH` (was
`GBAX_CORE_PATH`).