Add WOTD language rotation, fancy word detection, arena improvements, and death consolidation

- Rotate WOTD between Portuguese, French, and English daily with cognate filtering
- Replace LLM-based fancy word detection with DreamDict frequency data (batch API + cache)
- Track fancy word usage per user and add Wordsmith archetype
- Restore full arena combat flavor text and add player miss actions
- Consolidate death logic into Kill() method with 2-hour lockout
- Fix arena death XP grant missing level-up check
- Fix LLM wotd_used classification by injecting actual WOTD into prompt

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/plugin/adventure.go

@@ -675,10 +675,7 @@ func (p *AdventurePlugin) resolveActivity(ctx MessageContext, char *AdventureCha
 				p.SendMessage(gr, renderArenaDeathReprieve(char.DisplayName, loc.Name, nextWindow))
 			}
 		} else {
-			char.Alive = false
-			now := time.Now().UTC()
-			deadUntil := time.Date(now.Year(), now.Month(), now.Day()+1, 0, 0, 0, 0, time.UTC)
-			char.DeadUntil = &deadUntil
+			char.Kill()
 			char.GrudgeLocation = loc.Name
 		}
 	} else if hasGrudge && (result.Outcome == AdvOutcomeSuccess || result.Outcome == AdvOutcomeExceptional) {