Adv 2.0 Phase L1: Babysit pivot + legacy resolver retire

Babysit pivots from harvest service to pet-care + safe-rest perk:
- runBabysitDaily/runAutoBabysitDay/runBabysitAction deleted; replaced
  by runBabysitDailyTrickle (3 pet XP/day while subscribed).
- BabysitSafeRest predicate promotes Standard camps to Fortified-tier
  rest (HP+1d6, threat -5, resources refresh) and reduces wandering
  monster check campMod from 0 to -4. Hooks live in
  dnd_expedition_camp.go and dnd_expedition_night.go.
- !adventure babysit auto/focus subcommands removed; status/purchase
  DMs reflect the new perks.

Scheduler drops the auto-babysit fallback block (no more silent
debits + harvest-day for missed logins). Babysit subscribers still
skip the morning DM; trickle runs in the background.

TwinBee daily simulator self-contained: simulateTwinBeeOutcome +
simulateTwinBeeLoot replace the resolveAdvAction call against a
fake CombatLevel=35 character. Outcome distribution and reward
shape preserved; gold-share to active players unchanged.

Legacy activity resolver retired: resolveAdvAction,
advEligibleLocations, AdvEligibleLocation, resolveAdvEmptyOutcome
deleted from adventure_activities.go (zero production callers
post-babysit/twinbee). AdvActionResult kept — combat_bridge still
produces it for arena/dungeon flows; dies in L2/L3.

Migration plan doc gogobee_legacy_migration.md added: five-phase
L1-L5 plan covering arena (Adv 2.0 boss flow rebuild), co-op
deletion, perk-gate sweep, and final teardown of AdventureCharacter
+ CombatLevel + combat_engine.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/plugin/dnd_expedition_night.go

@@ -6,6 +6,8 @@ import (
 	"strings"
 
 	"gogobee/internal/flavor"
+
+	"maunium.net/go/mautrix/id"
 )
 
 // Phase 12 E2b — Wandering monster system & night phase resolution.
@@ -74,8 +76,14 @@ func resolveWanderingCheck(e *Expedition, charClass DnDClass, roll1d20 func() in
 		threatMod = (e.ThreatLevel - 30) / 10
 	}
 
+	// Babysit safe-rest: an active subscription gives Standard camps the
+	// fortified-tier night-risk reduction (the babysitter is watching).
+	effectiveCamp := e.Camp.Type
+	if effectiveCamp == CampTypeStandard && BabysitSafeRest(id.UserID(e.UserID)) {
+		effectiveCamp = CampTypeFortified
+	}
 	campMod := 0
-	switch e.Camp.Type {
+	switch effectiveCamp {
 	case CampTypeRough:
 		campMod = 3
 	case CampTypeFortified: