Adv 2.0 D&D Phase 12 E2d: Fortified Camp branch + overnight rest effects

§5.1 fortified camp unlocked in !camp, gated on exp.BossDefeated for
now (cache-site waypoints land in E3+). +2 SU cost was already in the
E1e cost table; this commit just stops rejecting the type.

§3 / §5.1 / §8.1 overnight rest applied at briefing rollover via
processOvernightCamp:
  - rough: HP floor of HPMax/2 (no spell refresh)
  - standard: full HP, exhaustion -1, refreshAllResources +
    refreshSpellSlots
  - fortified / base: standard rest + 1d6 HP bonus on wake +
    threat-clock -5 (§8.1 modifier)

The camp auto-breaks once the rest applies — staying camped multi-day
isn't a thing in the spec; the player can re-pitch on the next night
if they want to. Briefing body now includes a 💤 line summarizing the
HP/threat delta from the night's rest.

Combat-driven side of fortified ('+1d6 HP on wake' as a rare flavor
event) currently surfaces as the rest summary; a peaceful-night TwinBee
narration variant could come later if we add a dedicated pool — for
now reusing the existing CampEstablished ambience suffices.

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

internal/plugin/dnd_expedition_cycle.go

@@ -162,6 +162,19 @@ func (p *AdventurePlugin) deliverBriefing(e *Expedition, now time.Time) error {
 	e.Supplies = newSupplies
 	e.CurrentDay++
 
+	// E2d: overnight camp rest effects (HP/spells/threat). Auto-breaks
+	// the camp after applying. Run before threat drift so a fortified
+	// camp's −5 lands first and a same-day +3 drift can't push back over
+	// a threshold the rest just dropped.
+	restSummary := processOvernightCamp(e)
+	if restSummary != "" {
+		if fresh, err := getExpedition(e.ID); err == nil && fresh != nil {
+			e.ThreatLevel = fresh.ThreatLevel
+			e.SiegeMode = fresh.SiegeMode
+			e.Camp = fresh.Camp
+		}
+	}
+
 	// E2a: daily threat drift (+3 base, GM-mood modifier). No-op after
 	// boss kill. May cross a threshold and append a flavor-bearing log.
 	if _, _, err := applyDailyThreatDrift(e); err != nil {
@@ -170,6 +183,9 @@ func (p *AdventurePlugin) deliverBriefing(e *Expedition, now time.Time) error {
 
 	line := pickMorningBriefing(e.CurrentDay)
 	body := renderMorningBriefing(e, line, burn)
+	if restSummary != "" {
+		body += "\n💤 _" + restSummary + "_\n"
+	}
 
 	if uid := id.UserID(e.UserID); uid != "" {
 		if err := p.SendDM(uid, body); err != nil {