Bug fixes:
- Fix double "NEW FEATURE UNLOCKED" message and broken enum-to-key mapping for all UIFeatures
- Fix Spectre markup crash when opening inventory with colors unlocked (unescaped rarity brackets)
- Fix latent Spectre markup crash in ResourcePanel (unescaped bar brackets)
- Fix WeightedRandom.PickMultiple picking with replacement causing duplicate drops
- Fix double AddItem bug (BoxEngine + RenderEvents both adding to state)
- Add StatType and FontStyle fields to ItemDefinition (were in JSON but missing from C# record)
New features:
- Endgame box (Mythic) that appears when all 8 resources are discovered, contains Crown of Completion
- Completion percentage tracker as mid-game meta unlock (tier 3), shown in both renderers
- Adventure pool depletion: adventure sub-boxes with already-unlocked themes are removed from loot pool
- Global error handling with log file output (openthebox-error.log)
- Tiered meta progression: 5 sequential meta boxes replacing single box_meta
New tests (180 new, 228 total):
- 5 panel rendering test classes covering all enum values (Portrait, Resource, Stats, Inventory, Chat)
- RenderContext and RendererFactory logic tests
- SpectreRenderer output tests across 4 context configurations
- BasicRenderer output and input method tests
- Simulation state mutation and full-run completion tests