Add Misty & Arina NPCs, fix tier gating, babysit actions, Robbie filter, streak/scheduler bugs

Misty & Arina: random encounter NPCs triggered by chat message counting
(5-10 msg threshold, 7-day cooldown, 7.5% roll). Misty asks for €100 —
accept gives 7-day arena buff (20% gourmet food heals gear + 5 enemy dmg),
decline gives 7-day debuff (20% crowd revenge damage). Arina asks for €5000 —
accept gives 7-day sniper buff (8% instant kill in arena). Effects integrate
into arena round resolution after combat roll; sniper overrides death.

Other fixes:
- Tier gating now uses base skill only — buffs improve success, not access
- Babysitter uses all harvest actions (3/day, 4 on holidays) instead of 1
- Robbie collects all non-equipped items, not just slotted gear
- Robbie timing: fire on first tick >= target hour, not exact minute match
- Streak: dead players who acted still get streak credit
- Streak: dead players skip shame DM (use LastDeathDate, not Alive flag)
- Midnight ticker: in-memory date cache prevents 1439 wasted DB checks/day
- T1 loot values ~3x across all activities to close T1/T2 gap

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

internal/plugin/adventure_robbie.go

@@ -42,7 +42,7 @@ func (p *AdventurePlugin) robbieTicker() {
 			slog.Info("adventure: robbie target hour set", "hour", robbieTargetHour, "date", dateKey)
 		}
 
-		if now.Hour() != robbieTargetHour || now.Minute() != 0 {
+		if now.Hour() < robbieTargetHour {
 			continue
 		}
 
@@ -180,15 +180,18 @@ func (p *AdventurePlugin) robbieVisitPlayer(userID id.UserID, displayName string
 func robbieQualifyingItems(inv []AdvItem, equip map[EquipmentSlot]*AdvEquipment) []AdvItem {
 	var result []AdvItem
 	for _, item := range inv {
-		// Only gear with a slot (skip ores, wood, fruit, gems, fish, etc.)
-		if item.Slot == "" {
-			continue
-		}
 		// Never touch Arena gear or cards
 		if item.Type == "ArenaGear" || item.Type == "card" {
 			continue
 		}
 
+		// Non-gear items (ores, fish, junk, treasure, etc.) — always take
+		if item.Slot == "" {
+			result = append(result, item)
+			continue
+		}
+
+		// Slotted gear — check against equipped piece
 		eq, hasSlot := equip[item.Slot]
 		if !hasSlot {
 			continue