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_test.go

@@ -5,7 +5,7 @@ import "testing"
 func TestAdvEquipmentScore_Empty(t *testing.T) {
 	score := advEquipmentScore(map[EquipmentSlot]*AdvEquipment{})
 	if score != 0 {
-		t.Errorf("empty equipment should score 0, got %d", score)
+		t.Errorf("empty equipment should score 0, got %.2f", score)
 	}
 }
 
@@ -16,8 +16,8 @@ func TestAdvEquipmentScore_WeaponDoubled(t *testing.T) {
 	}
 	score := advEquipmentScore(equip)
 	// Weapon: 3*2=6, Armor: 3
-	if score != 9 {
-		t.Errorf("got %d, want 9 (weapon 6 + armor 3)", score)
+	if score != 9.0 {
+		t.Errorf("got %.2f, want 9 (weapon 6 + armor 3)", score)
 	}
 }
 
@@ -27,8 +27,8 @@ func TestAdvEquipmentScore_LowConditionHalved(t *testing.T) {
 	}
 	score := advEquipmentScore(equip)
 	// Tier 4, halved = 2
-	if score != 2 {
-		t.Errorf("got %d, want 2 (tier 4 halved for low condition)", score)
+	if score != 2.0 {
+		t.Errorf("got %.2f, want 2 (tier 4 halved for low condition)", score)
 	}
 }
 
@@ -42,8 +42,8 @@ func TestAdvEquipmentScore_FullLoadout(t *testing.T) {
 	}
 	score := advEquipmentScore(equip)
 	// Weapon: 5*2=10, others: 5*4=20, total=30
-	if score != 30 {
-		t.Errorf("got %d, want 30", score)
+	if score != 30.0 {
+		t.Errorf("got %.2f, want 30", score)
 	}
 }