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_activities.go

@@ -130,7 +130,7 @@ func findAdvLocationByTier(activity AdvActivityType, tier int) *AdvLocation {
 // ── Loot Tables ──────────────────────────────────────────────────────────────
 
 var advDungeonLoot = map[int][]AdvLootDef{
-	1: {{"Copper Coins", "treasure", 1, 5}, {"Rat Pelt", "treasure", 3, 8}, {"Mouldy Bread", "treasure", 1, 3}, {"Bent Nail", "treasure", 1, 2}},
+	1: {{"Copper Coins", "treasure", 5, 12}, {"Rat Pelt", "treasure", 8, 18}, {"Mouldy Bread", "treasure", 3, 8}, {"Bent Nail", "treasure", 2, 6}},
 	2: {{"Iron Scraps", "ore", 20, 40}, {"Goblin Trinket", "treasure", 25, 50}, {"Small Gem", "gem", 40, 80}},
 	3: {{"Silver Bar", "ore", 100, 200}, {"Ancient Artifact", "treasure", 150, 300}, {"Quality Gem", "gem", 200, 400}},
 	4: {{"Gold Ingot", "ore", 500, 1000}, {"Enchanted Fragment", "treasure", 800, 1500}, {"Rare Gem", "gem", 1000, 2000}},
@@ -138,7 +138,7 @@ var advDungeonLoot = map[int][]AdvLootDef{
 }
 
 var advMiningLoot = map[int][]AdvLootDef{
-	1: {{"Copper Ore", "ore", 2, 5}, {"Tin Ore", "ore", 3, 6}, {"Coal", "ore", 2, 4}},
+	1: {{"Copper Ore", "ore", 5, 12}, {"Tin Ore", "ore", 6, 14}, {"Coal", "ore", 4, 10}},
 	2: {{"Iron Ore", "ore", 15, 25}, {"Lead Ore", "ore", 18, 30}, {"Saltpetre", "ore", 20, 40}},
 	3: {{"Silver Ore", "ore", 60, 100}, {"Quartz", "ore", 80, 120}, {"Nickel Ore", "ore", 70, 110}},
 	4: {{"Gold Ore", "ore", 200, 400}, {"Sapphire", "gem", 300, 500}, {"Titanium Ore", "ore", 250, 450}},
@@ -146,7 +146,7 @@ var advMiningLoot = map[int][]AdvLootDef{
 }
 
 var advForagingLoot = map[int][]AdvLootDef{
-	1: {{"Berries", "fruit", 1, 4}, {"Twigs", "wood", 2, 5}, {"Common Herbs", "fruit", 3, 8}},
+	1: {{"Berries", "fruit", 3, 10}, {"Twigs", "wood", 5, 12}, {"Common Herbs", "fruit", 6, 15}},
 	2: {{"Hardwood", "wood", 10, 20}, {"Wild Fruit", "fruit", 12, 22}, {"Mushrooms", "fruit", 15, 30}},
 	3: {{"Ancient Timber", "wood", 40, 80}, {"Rare Herbs", "fruit", 50, 100}, {"Honey", "fruit", 60, 120}},
 	4: {{"Exotic Wood", "wood", 150, 300}, {"Tropical Fruits", "fruit", 180, 400}, {"Spores", "fruit", 200, 500}},
@@ -154,7 +154,7 @@ var advForagingLoot = map[int][]AdvLootDef{
 }
 
 var advFishingLoot = map[int][]AdvLootDef{
-	1: {{"Sad Fish", "fish", 1, 4}, {"Old Boot", "junk", 2, 5}, {"Tin Can", "junk", 1, 3}},
+	1: {{"Sad Fish", "fish", 4, 10}, {"Old Boot", "junk", 5, 12}, {"Tin Can", "junk", 3, 8}},
 	2: {{"Creek Trout", "fish", 12, 22}, {"Iron Scale", "fish", 15, 28}, {"River Pearl", "gem", 20, 40}},
 	3: {{"Silver Bass", "fish", 50, 90}, {"Lake Sturgeon", "fish", 60, 110}, {"Blooper Ink", "treasure", 80, 150}},
 	4: {{"Deep Eel", "fish", 180, 350}, {"River Serpent Scale", "treasure", 250, 500}, {"Abyssal Pearl", "gem", 300, 600}},
@@ -376,10 +376,9 @@ func advLocationCooldown(userID id.UserID, location string) time.Duration {
 // advIsEligible checks if a character can enter a location.
 // Returns (eligible, inPenaltyZone).
 func advIsEligible(char *AdventureCharacter, equip map[EquipmentSlot]*AdvEquipment, loc *AdvLocation, bonuses *AdvBonusSummary) (bool, bool) {
-	// Get effective skill level
-	skillLevel := advEffectiveSkill(char, loc.Activity, bonuses)
-
-	if skillLevel < loc.MinLevel {
+	// Tier gating uses base skill only — buffs improve success chances, not access.
+	baseLevel := advBaseSkill(char, loc.Activity)
+	if baseLevel < loc.MinLevel {
 		return false, false
 	}
 
@@ -397,11 +396,25 @@ func advIsEligible(char *AdventureCharacter, equip map[EquipmentSlot]*AdvEquipme
 		return false, false
 	}
 
-	// Penalty zone: within 3 levels of minimum
-	penalty := skillLevel-loc.MinLevel < 3
+	// Penalty zone: within 3 levels of minimum (base skill only)
+	penalty := baseLevel-loc.MinLevel < 3
 	return true, penalty
 }
 
+func advBaseSkill(char *AdventureCharacter, activity AdvActivityType) int {
+	switch activity {
+	case AdvActivityDungeon:
+		return char.CombatLevel
+	case AdvActivityMining:
+		return char.MiningSkill
+	case AdvActivityForaging:
+		return char.ForagingSkill
+	case AdvActivityFishing:
+		return char.FishingSkill
+	}
+	return 1
+}
+
 func advEffectiveSkill(char *AdventureCharacter, activity AdvActivityType, bonuses *AdvBonusSummary) int {
 	switch activity {
 	case AdvActivityDungeon: