Add hospital revival, Robbie bandit, MW/shop fixes, float64 scoring

- St. Guildmore's Memorial Hospital: !hospital command with Nurse Joy,
  procedural itemized billing, same-day revival, 6-hour dead timer,
  hospital ad after death, 2-hour nudge follow-up
- Robbie the Friendly Bandit: automated inventory cleaner, random daily
  visits (8-21 UTC, 40% chance), collects sub-tier gear at €50/item,
  donates to community pot, drops Get Out of Medical Debt Free card
- Fix MW auto-equip: T1 MW no longer replaces better equipped gear
- Fix shop MW block: allow purchasing upgrades over lower-tier MW
- Float64 equipment scoring: advEffectiveTier and advEquipmentScore
  return float64, no mid-calculation truncation (MW 1.25x, Arena 1.5x)
- Fix markdown rendering: convert *asterisk* to _underscore_ italics
  across all flavor text files (shop, blacksmith, rival, hospital)

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

internal/plugin/stats.go

@@ -398,7 +398,7 @@ func (p *StatsPlugin) handleSuperStats(ctx MessageContext) error {
 		// Equipment score (use canonical scoring function)
 		equip, eqErr := loadAdvEquipment(id.UserID(uid))
 		if eqErr == nil && len(equip) > 0 {
-			sb.WriteString(fmt.Sprintf("   Equipment score: %d\n", advEquipmentScore(equip)))
+			sb.WriteString(fmt.Sprintf("   Equipment score: %.1f\n", advEquipmentScore(equip)))
 		}
 		sb.WriteString("\n")
 	}