Adv 2.0 D&D Phase R7: post-completion audit hardening

High-priority fixes from the multi-agent audit of Adventure 2.0:

- Phase 11 nil-deref cluster: zoneOrFallback() helper replaces 8 unsafe
  getZone(_) sites in dnd_zone_cmd.go. Corrupted zone IDs render a
  placeholder instead of panicking.
- Briefing/recap idempotency: deliverBriefing/deliverRecap now claim
  the rollover via a conditional UPDATE. Double-fires from clock skew
  or restart become no-ops; supply burn and day++ no longer reapply.
- Graceful ticker shutdown: AdventurePlugin gains stopCh + Stop(); all
  11 background tickers now select on stopCh in addition to ticker.C.
- Mood decay (§3.2): math.Round(elapsed*2) replaces int() truncation
  so sub-hour gaps decay correctly.
- 24h auto-abandon (§4.3): getActiveZoneRun returns clean slate and
  abandons stale runs whose LastActionAt is over 24h old.
- Respec / auto-migrate orphan cleanup: !respec and the auto-migrated
  draft wipe now abandon active zone runs and expeditions before
  deleting the dnd_character row.
- Phase R combat-link: applyBossDefeatThreat now wired from
  resolveBossRoom (-20 threat); applyRoomCombatThreatForUser adds
  +5/+8 from non-boss/elite kills (§8.1).
- Starvation → forced extraction: briefing-time check forces extract
  with §10.2 coin tax when supplies hit zero.
- GMNat20/Nat1 narration wired into resolveCombatRoom and
  resolveBossRoom (nat-20 takes precedence over nat-1).
- Treasure-undo race: LoadAndDelete on both timer-fire and `undo`
  paths so only one side wins.
- Battle Master: Disarming, Menacing, Parry maneuvers added (3 → 6
  of 10). Remaining 4 (Pushing, Goading, Riposte, Commander's Strike)
  documented inline as needing ally/reaction mechanics the engine
  doesn't model.
- Threat-70 warning: tracked in RegionState["siege_warning_fired"]
  so a drop-and-recross doesn't re-fire the beat.
- region_state JSON decode error now logged via slog.Warn instead
  of silently discarded.

Failing TestProdDB_DnDLayer fixed via option (a): track migrated
characters and only run round-trip / idempotency assertions on those,
skipping pre-existing prod-DB rows accumulated from live bot use.

New tests in dnd_audit_phase_R7_test.go cover: 24h auto-abandon,
briefing double-fire idempotency, threat-70 warning idempotency,
multi-region extract→resume state preservation, and starvation
forced-extraction.

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

internal/plugin/adventure_mortgage.go

@@ -107,35 +107,40 @@ func (p *AdventurePlugin) mortgageTicker() {
 	ticker := time.NewTicker(1 * time.Hour)
 	defer ticker.Stop()
 
-	for range ticker.C {
-		now := time.Now().UTC()
-		// Run on Mondays only (FRED updates Thursdays, we process Mondays)
-		if now.Weekday() != time.Monday {
-			continue
+	for {
+		select {
+		case <-p.stopCh:
+			return
+		case <-ticker.C:
+			now := time.Now().UTC()
+			// Run on Mondays only (FRED updates Thursdays, we process Mondays)
+			if now.Weekday() != time.Monday {
+				continue
+			}
+
+			_, week := now.ISOWeek()
+			dateKey := fmt.Sprintf("%d-W%02d", now.Year(), week)
+			jobName := "mortgage_weekly"
+			if db.JobCompleted(jobName, dateKey) {
+				continue
+			}
+
+			slog.Info("mortgage: running weekly payment processing")
+
+			// Fetch fresh rate and compare with previous
+			newRate := getCurrentMortgageRate()
+			oldRate := p.getLastKnownRate()
+
+			if oldRate > 0 && oldRate != newRate {
+				p.sendMortgageRateChangeDMs(oldRate, newRate)
+			}
+			p.setLastKnownRate(newRate)
+
+			// Process payments
+			p.processMortgagePayments()
+
+			db.MarkJobCompleted(jobName, dateKey)
 		}
-
-		_, week := now.ISOWeek()
-		dateKey := fmt.Sprintf("%d-W%02d", now.Year(), week)
-		jobName := "mortgage_weekly"
-		if db.JobCompleted(jobName, dateKey) {
-			continue
-		}
-
-		slog.Info("mortgage: running weekly payment processing")
-
-		// Fetch fresh rate and compare with previous
-		newRate := getCurrentMortgageRate()
-		oldRate := p.getLastKnownRate()
-
-		if oldRate > 0 && oldRate != newRate {
-			p.sendMortgageRateChangeDMs(oldRate, newRate)
-		}
-		p.setLastKnownRate(newRate)
-
-		// Process payments
-		p.processMortgagePayments()
-
-		db.MarkJobCompleted(jobName, dateKey)
 	}
 }