Wire the Hunter minigame into Oregon Trail's hunting

#9 in Riparion/riparion-retro — merged 2026-06-09

Summary

• Replaces the QuickDraw word-tap with the minigames-kit Hunter shooting gallery for the "Go hunting" action; gunfights (bandits/wolves/riders) keep QuickDraw.
• Marksman self-rating now scales the rounds the hunter brings (better self-rating → fewer rounds), preserving the original's self-handicap.
• Adds Mode::Hunt + screens/hunt.rs, an engine resolve_hunt(hit, shots_fired), and enables the kit's hunter feature. Retires the b1-based finish_hunt and the now-unused ShotPurpose::Hunt.

Review fixes folded in

• Tailwind: add minigames-kit/src to the @source paths and regenerate assets/tailwind.css, so grid-cols-2/py-5 (used by QuickDraw, which has no inline fallback) are no longer purged — the gunfight layout stays intact.
• Saves: bump SAVE_VERSION to 2, since dropping ShotPurpose::Hunt makes a v1 save written mid-hunt undeserializable; the bump discards stale saves cleanly instead of silently resetting to a fresh game.

Also

• Adds a justfile with per-game release/dev dx serve recipes.

Testing

• cargo test -p oregon-trail → 17 passed (hunt-path tests migrated to Mode::Hunt/resolve_hunt).
• cargo test -p minigames-kit --features hunter → green.

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