- Add AdventureUnlockedEvent emitted by MetaEngine when a new adventure
is unlocked, displayed as a CTA in the loot reveal flow
- Rebalance box_of_boxes: reduce box_not_great weight 10→7, boost
box_ok_tier 5→7 for more variety in early game
- Add box_ok_tier and box_meta_basics drops to box_not_great loot table
so basic boxes can escape the loop
- Double box_meta_basics weight in box_ok_tier (1→2) for faster
meta progression
- Update bugs.md: resolve all 4 FIXME items