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/hangman.go

@@ -574,7 +574,7 @@ func (p *HangmanPlugin) startMultilingualGame(ctx MessageContext, lang, clueLang
 	// Pick a word, optionally with a translatable clue
 	var word, clueWord string
 	for attempt := 0; attempt < 3; attempt++ {
-		candidate, err := p.dict.RandomWord(lang, "", 4, 12)
+		candidate, err := p.dict.RandomWord(lang, "", 4, 12, 0)
 		if err != nil {
 			slog.Error("hangman: random word failed", "lang", lang, "err", err)
 			rollback()
@@ -597,7 +597,7 @@ func (p *HangmanPlugin) startMultilingualGame(ctx MessageContext, lang, clueLang
 
 	if word == "" {
 		// Fallback: start without a clue
-		candidate, err := p.dict.RandomWord(lang, "", 4, 12)
+		candidate, err := p.dict.RandomWord(lang, "", 4, 12, 0)
 		if err != nil {
 			rollback()
 			return p.SendReply(ctx.RoomID, ctx.EventID, "❌ Dictionary service unavailable. Try again shortly.")