Adv 2.0 L4e reader flip (read-only sites): house state via loadHouseState

dnd_rest long-rest eligibility, dnd_sheet housing display, and
petShouldArrive / mistyHousingHint now source house state from
player_meta via loadHouseState(userID) instead of *AdventureCharacter.
petShouldArrive, mistyHousingHint, and renderDnDSheet gained a
HouseState parameter; scheduler and Misty NPC callers load it.
Reader flip inside adventure_housing.go itself stays deferred — its
mutation paths bundle with cutting AdvCharacter writes post-soak.

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

internal/plugin/adventure_scheduler.go

@@ -115,7 +115,8 @@ func (p *AdventurePlugin) sendMorningDMs() {
 		}
 
 		// Pet arrival check (fires before normal morning DM)
-		if petShouldArrive(&char) {
+		house, _ := loadHouseState(char.UserID)
+		if petShouldArrive(&char, house) {
 			p.petArrivalDM(char.UserID)
 			continue
 		}