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/adventure_arena.go

@@ -572,7 +572,14 @@ func (p *AdventurePlugin) resolveArenaDeath(ctx MessageContext, run *ArenaRun, c
 	text := renderArenaCombatLog(combatLog, monster, false, 0, arenaParticipationXP, closer)
 	text += fmt.Sprintf("\nLost earnings: €%d\n", lostEarnings)
 
-	return p.SendDM(ctx.Sender, text)
+	if err := p.SendDM(ctx.Sender, text); err != nil {
+		slog.Error("arena: failed to send death DM", "user", ctx.Sender, "err", err)
+	}
+
+	// Send hospital ad (delayed)
+	p.sendHospitalAd(ctx.Sender, char)
+
+	return nil
 }
 
 func (p *AdventurePlugin) arenaCompleteTier5(ctx MessageContext, run *ArenaRun, char *AdventureCharacter, tier *ArenaTier, prefixText string) error {