Adv 2.0 D&D Phase 11 D1d: TwinBee narration + mood triggers

Wires the existing internal/flavor TwinBee GM pools into the !zone
state machine. Adds GMNarrationType, mood band derivation, the §3.2
mood-event delta table, and ±2/hr passive decay toward 50. Zone enter
narrates the entry room; advance narrates each subsequent room (boss
rooms use the named BossEntry* pools, completion uses ZoneComplete
and applies MoodEventZoneComplete). Line selection is deterministic
on (runID, roomIdx) so repeat reads render the same prose.

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

internal/plugin/dnd_zone_cmd.go

@@ -185,6 +185,10 @@ func (p *AdventurePlugin) zoneCmdEnter(ctx MessageContext, c *DnDCharacter, rest
 	var b strings.Builder
 	b.WriteString(fmt.Sprintf("🗝 **Entering %s** _(T%d, %d rooms)_\n\n", zone.Display, int(zone.Tier), run.TotalRooms))
 	b.WriteString("_" + zone.Hook + "_\n\n")
+	if line := twinBeeLine(zone.ID, GMRoomEntry, run.RunID, run.CurrentRoom); line != "" {
+		b.WriteString(line)
+		b.WriteString("\n\n")
+	}
 	b.WriteString(fmt.Sprintf("**Room 1/%d — %s.** Use `!zone advance` to proceed, `!zone map` for layout.",
 		run.TotalRooms, prettyRoomType(run.CurrentRoomType())))
 	return p.SendDM(ctx.Sender, b.String())
@@ -200,6 +204,7 @@ func (p *AdventurePlugin) zoneCmdStatus(ctx MessageContext) error {
 	if run == nil {
 		return p.SendDM(ctx.Sender, "No active zone run. Use `!zone list` then `!zone enter <id>`.")
 	}
+	_ = applyMoodDecayIfStale(run)
 	zone, _ := getZone(run.ZoneID)
 	var b strings.Builder
 	b.WriteString(fmt.Sprintf("**%s** — room %d/%d (%s)\n",
@@ -292,6 +297,7 @@ func (p *AdventurePlugin) zoneCmdAdvance(ctx MessageContext) error {
 	if run == nil {
 		return p.SendDM(ctx.Sender, "No active zone run. Use `!zone enter <id>`.")
 	}
+	_ = applyMoodDecayIfStale(run)
 	zone, _ := getZone(run.ZoneID)
 	prev := run.CurrentRoomType()
 	prevIdx := run.CurrentRoom
@@ -300,15 +306,32 @@ func (p *AdventurePlugin) zoneCmdAdvance(ctx MessageContext) error {
 		return p.SendDM(ctx.Sender, "Couldn't advance: "+err.Error())
 	}
 	if next == "" {
-		// Run completed via boss room.
+		// Boss room cleared → zone complete. Bump mood per design §3.2.
+		_, _ = applyMoodEvent(run.RunID, MoodEventZoneComplete)
 		var b strings.Builder
 		b.WriteString(fmt.Sprintf("🏆 **Cleared %s.** Boss defeated. Run complete.\n\n", zone.Display))
+		if line := twinBeeLine(zone.ID, GMZoneComplete, run.RunID, prevIdx); line != "" {
+			b.WriteString(line)
+			b.WriteString("\n\n")
+		}
 		b.WriteString("_(Combat resolution + loot rolls land in D1e — for now this is a clean state-machine win.)_")
 		return p.SendDM(ctx.Sender, b.String())
 	}
+	nextIdx := run.CurrentRoom + 1 // markRoomCleared already advanced; reflect for narration salt
 	var b strings.Builder
-	b.WriteString(fmt.Sprintf("✓ Cleared room %d (%s).\n", prevIdx+1, prettyRoomType(prev)))
-	b.WriteString(fmt.Sprintf("**Room %d/%d — %s.** ", run.CurrentRoom+2, run.TotalRooms, prettyRoomType(next)))
+	b.WriteString(fmt.Sprintf("✓ Cleared room %d (%s).\n\n", prevIdx+1, prettyRoomType(prev)))
+	if next == RoomBoss {
+		if line := twinBeeLine(zone.ID, GMBossEntry, run.RunID, nextIdx); line != "" {
+			b.WriteString(line)
+			b.WriteString("\n\n")
+		}
+	} else {
+		if line := twinBeeLine(zone.ID, GMRoomEntry, run.RunID, nextIdx); line != "" {
+			b.WriteString(line)
+			b.WriteString("\n\n")
+		}
+	}
+	b.WriteString(fmt.Sprintf("**Room %d/%d — %s.** ", nextIdx+1, run.TotalRooms, prettyRoomType(next)))
 	b.WriteString("`!zone advance` to continue.")
 	return p.SendDM(ctx.Sender, b.String())
 }

internal/plugin/dnd_zone_narration.go

@@ -0,0 +1,274 @@
+package plugin
+
+import (
+	"fmt"
+	"hash/fnv"
+	"time"
+
+	"gogobee/internal/db"
+	"gogobee/internal/flavor"
+)
+
+// Phase 11 D1d — TwinBee narration + GM mood triggers. Implements
+// `gogobee_dungeon_zones.md` §3 (TwinBee GM System) on top of the D1b
+// state machine.
+//
+// Flavor lines come from the canonical pools in internal/flavor
+// (twinbee_gm_flavor.go) — this file does not author new prose.
+// Per-zone overrides are routed through zoneRoomEntryPool / bossEntryPool.
+//
+// Mood-banded *flavor* selection is a D6 polish item. D1d wires the
+// score, the event triggers, and the passive decay; mood currently
+// surfaces as the human label in `!zone status` and gates downstream
+// generosity (loot rolls, hint drops) once those land.
+
+// GMNarrationType — see design doc §7.
+type GMNarrationType string
+
+const (
+	GMRoomEntry    GMNarrationType = "room_entry"
+	GMCombatStart  GMNarrationType = "combat_start"
+	GMCombatEnd    GMNarrationType = "combat_end"
+	GMNat20        GMNarrationType = "nat_20"
+	GMNat1         GMNarrationType = "nat_1"
+	GMBossEntry    GMNarrationType = "boss_entry"
+	GMBossDeath    GMNarrationType = "boss_death"
+	GMPlayerDeath  GMNarrationType = "player_death"
+	GMZoneComplete GMNarrationType = "zone_complete"
+	GMTrapDetected GMNarrationType = "trap_detected"
+	GMTrapTripped  GMNarrationType = "trap_tripped"
+	GMLore         GMNarrationType = "lore"
+)
+
+// MoodBand — five-state band derived from the 0–100 score.
+type MoodBand int
+
+const (
+	MoodBandHostile MoodBand = iota
+	MoodBandGrumpy
+	MoodBandNeutral
+	MoodBandFriendly
+	MoodBandEffusive
+)
+
+// moodBand maps a raw score to its band per design doc §3.2.
+func moodBand(score int) MoodBand {
+	switch {
+	case score >= 80:
+		return MoodBandEffusive
+	case score >= 60:
+		return MoodBandFriendly
+	case score >= 40:
+		return MoodBandNeutral
+	case score >= 20:
+		return MoodBandGrumpy
+	default:
+		return MoodBandHostile
+	}
+}
+
+// zoneRoomEntryPool returns the zone-specific RoomEntry pool when one
+// exists, else the generic pool. Pools live in internal/flavor.
+func zoneRoomEntryPool(zoneID ZoneID) []string {
+	switch zoneID {
+	case ZoneGoblinWarrens:
+		return append(append([]string{}, flavor.RoomEntryGoblinWarrens...), flavor.RoomEntryGeneric...)
+	case ZoneCryptValdris:
+		return append(append([]string{}, flavor.RoomEntryCryptValdris...), flavor.RoomEntryGeneric...)
+	case ZoneForestShadows:
+		return append(append([]string{}, flavor.RoomEntryForestShadows...), flavor.RoomEntryGeneric...)
+	case ZoneManorBlackspire:
+		return append(append([]string{}, flavor.RoomEntryHauntedManor...), flavor.RoomEntryGeneric...)
+	case ZoneUnderdark:
+		return append(append([]string{}, flavor.RoomEntryUnderdark...), flavor.RoomEntryGeneric...)
+	case ZoneDragonsLair:
+		return append(append([]string{}, flavor.RoomEntryDragonsLair...), flavor.RoomEntryGeneric...)
+	}
+	return flavor.RoomEntryGeneric
+}
+
+// bossEntryPool returns the boss-specific pool when one exists, else
+// the generic boss-entry pool.
+func bossEntryPool(zoneID ZoneID) []string {
+	switch zoneID {
+	case ZoneGoblinWarrens:
+		return flavor.BossEntryGrol
+	case ZoneCryptValdris:
+		return flavor.BossEntryValdris
+	case ZoneForestShadows:
+		return flavor.BossEntryHollowKing
+	case ZoneDragonsLair:
+		return flavor.BossEntryInfernax
+	case ZoneAbyssPortal:
+		return flavor.BossEntryBelaxath
+	}
+	return flavor.BossEntryGeneric
+}
+
+// pickPool routes a narration type to the right []string pool from
+// internal/flavor. Returns nil for kinds that have no pool yet (caller
+// is expected to skip rendering or fall back to a static line).
+func pickPool(zoneID ZoneID, kind GMNarrationType) []string {
+	switch kind {
+	case GMRoomEntry:
+		return zoneRoomEntryPool(zoneID)
+	case GMBossEntry:
+		return bossEntryPool(zoneID)
+	case GMCombatStart:
+		return flavor.CombatStart
+	case GMCombatEnd:
+		return flavor.CombatVictory
+	case GMNat20:
+		return flavor.Nat20
+	case GMNat1:
+		return flavor.Nat1
+	case GMBossDeath:
+		return flavor.BossDeath
+	case GMPlayerDeath:
+		return flavor.PlayerDeath
+	case GMZoneComplete:
+		return flavor.ZoneComplete
+	case GMTrapDetected:
+		return flavor.TrapDetected
+	case GMTrapTripped:
+		return flavor.TrapTriggered
+	case GMLore:
+		return flavor.LoreLines
+	}
+	return nil
+}
+
+// pickLineDeterministic — stable selection across (runID, salt). Same
+// inputs always yield the same line, so a player who re-reads status
+// sees the same prose; different rooms / different runs vary.
+func pickLineDeterministic(lines []string, runID string, salt int) string {
+	if len(lines) == 0 {
+		return ""
+	}
+	h := fnv.New64a()
+	h.Write([]byte(runID))
+	var sb [8]byte
+	for i := 0; i < 8; i++ {
+		sb[i] = byte(salt >> (8 * i))
+	}
+	h.Write(sb[:])
+	return lines[int(h.Sum64()%uint64(len(lines)))]
+}
+
+// twinBeeLine renders the TwinBee narration block for a given event,
+// drawing from the canonical internal/flavor pools.
+//
+// roomIdx is folded into the deterministic selector so the same room
+// in the same run always renders the same prose (idempotent reads).
+func twinBeeLine(zoneID ZoneID, kind GMNarrationType, runID string, roomIdx int) string {
+	pool := pickPool(zoneID, kind)
+	line := pickLineDeterministic(pool, runID, roomIdx)
+	if line == "" {
+		return ""
+	}
+	return "🎭 **TwinBee:** " + line
+}
+
+// ── Mood event table & application ───────────────────────────────────────────
+
+// GMMoodEvent enumerates the mood-modifier triggers from design doc §3.2.
+type GMMoodEvent string
+
+const (
+	MoodEventZoneComplete       GMMoodEvent = "zone_complete"
+	MoodEventPlayerDeath        GMMoodEvent = "player_death"
+	MoodEventNat20              GMMoodEvent = "nat_20"
+	MoodEventNat1               GMMoodEvent = "nat_1"
+	MoodEventCommunityMilestone GMMoodEvent = "community_milestone"
+	MoodEventDowntime           GMMoodEvent = "downtime"
+	MoodEventTaunt              GMMoodEvent = "taunt"
+	MoodEventCompliment         GMMoodEvent = "compliment"
+)
+
+// moodEventDelta — design doc §3.2 mood-modifier table.
+var moodEventDelta = map[GMMoodEvent]int{
+	MoodEventZoneComplete:       +10,
+	MoodEventPlayerDeath:        -5,
+	MoodEventNat20:              +3,
+	MoodEventNat1:               -2,
+	MoodEventCommunityMilestone: +15,
+	MoodEventDowntime:           -20,
+	MoodEventTaunt:              -10,
+	MoodEventCompliment:         +5,
+}
+
+// MoodEventDelta exposes the static delta for an event (test use).
+func MoodEventDelta(ev GMMoodEvent) int { return moodEventDelta[ev] }
+
+// applyMoodEvent updates the run's mood by the event's delta. Returns
+// the new mood score after clamping.
+func applyMoodEvent(runID string, ev GMMoodEvent) (int, error) {
+	delta, ok := moodEventDelta[ev]
+	if !ok {
+		return 0, fmt.Errorf("unknown mood event: %s", ev)
+	}
+	if err := adjustGMMood(runID, delta); err != nil {
+		return 0, err
+	}
+	r, err := getZoneRun(runID)
+	if err != nil || r == nil {
+		return 0, err
+	}
+	return r.GMMood, nil
+}
+
+// passiveDecayMood drifts the mood toward 50 at ±2/hour, scaled by
+// hours elapsed since lastTouched. Pure function; caller persists.
+//
+// Design doc §3.2: "Mood decays toward 50 at a rate of ±2 per hour
+// (passive rebalancing)." Long-idle runs reset toward neutral.
+func passiveDecayMood(score int, lastTouched, now time.Time) int {
+	hours := int(now.Sub(lastTouched).Hours())
+	if hours <= 0 {
+		return clampMood(score)
+	}
+	const ratePerHour = 2
+	drift := hours * ratePerHour
+	switch {
+	case score > 50:
+		score -= drift
+		if score < 50 {
+			score = 50
+		}
+	case score < 50:
+		score += drift
+		if score > 50 {
+			score = 50
+		}
+	}
+	return clampMood(score)
+}
+
+func clampMood(s int) int {
+	if s < 0 {
+		return 0
+	}
+	if s > 100 {
+		return 100
+	}
+	return s
+}
+
+// applyMoodDecayIfStale persists a passive-decay correction when the
+// run has been idle long enough to drift. Cheap no-op on fresh runs.
+func applyMoodDecayIfStale(r *DungeonRun) error {
+	if r == nil {
+		return nil
+	}
+	newMood := passiveDecayMood(r.GMMood, r.LastActionAt, time.Now().UTC())
+	if newMood == r.GMMood {
+		return nil
+	}
+	if _, err := db.Get().Exec(`
+		UPDATE dnd_zone_run SET gm_mood = ? WHERE run_id = ?`,
+		newMood, r.RunID); err != nil {
+		return err
+	}
+	r.GMMood = newMood
+	return nil
+}

internal/plugin/dnd_zone_narration_test.go

@@ -0,0 +1,193 @@
+package plugin
+
+import (
+	"strings"
+	"testing"
+	"time"
+
+	"maunium.net/go/mautrix/id"
+)
+
+// Phase 11 D1d — TwinBee narration + mood event tests.
+
+func TestMoodBand_Boundaries(t *testing.T) {
+	cases := []struct {
+		score int
+		want  MoodBand
+	}{
+		{0, MoodBandHostile}, {19, MoodBandHostile},
+		{20, MoodBandGrumpy}, {39, MoodBandGrumpy},
+		{40, MoodBandNeutral}, {59, MoodBandNeutral},
+		{60, MoodBandFriendly}, {79, MoodBandFriendly},
+		{80, MoodBandEffusive}, {100, MoodBandEffusive},
+	}
+	for _, c := range cases {
+		if got := moodBand(c.score); got != c.want {
+			t.Errorf("moodBand(%d) = %d, want %d", c.score, got, c.want)
+		}
+	}
+}
+
+func TestMoodEventDelta_DesignDocTable(t *testing.T) {
+	want := map[GMMoodEvent]int{
+		MoodEventZoneComplete:       +10,
+		MoodEventPlayerDeath:        -5,
+		MoodEventNat20:              +3,
+		MoodEventNat1:               -2,
+		MoodEventCommunityMilestone: +15,
+		MoodEventDowntime:           -20,
+		MoodEventTaunt:              -10,
+		MoodEventCompliment:         +5,
+	}
+	for ev, delta := range want {
+		if got := MoodEventDelta(ev); got != delta {
+			t.Errorf("delta(%s) = %d, want %d", ev, got, delta)
+		}
+	}
+}
+
+func TestPassiveDecayMood_DriftsTowardFifty(t *testing.T) {
+	now := time.Date(2026, 5, 8, 12, 0, 0, 0, time.UTC)
+	cases := []struct {
+		name     string
+		score    int
+		hoursAgo int
+		want     int
+	}{
+		{"high-score-decays-down", 80, 5, 70},   // -2/hr * 5
+		{"high-clamps-at-50", 80, 100, 50},      // would overshoot
+		{"low-score-decays-up", 10, 5, 20},      // +2/hr * 5
+		{"low-clamps-at-50", 10, 100, 50},       // would overshoot
+		{"already-50-no-change", 50, 100, 50},   // neutral stays neutral
+		{"fresh-no-decay", 80, 0, 80},           // no time elapsed
+		{"sub-hour-no-decay", 80, 0, 80},        // hours==0 → no drift
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			last := now.Add(-time.Duration(c.hoursAgo) * time.Hour)
+			if got := passiveDecayMood(c.score, last, now); got != c.want {
+				t.Errorf("decay(%d, %dh ago) = %d, want %d", c.score, c.hoursAgo, got, c.want)
+			}
+		})
+	}
+}
+
+func TestTwinBeeLine_DeterministicAcrossCalls(t *testing.T) {
+	a := twinBeeLine(ZoneGoblinWarrens, GMRoomEntry, "abc123", 2)
+	b := twinBeeLine(ZoneGoblinWarrens, GMRoomEntry, "abc123", 2)
+	if a != b {
+		t.Errorf("non-deterministic:\n  a=%q\n  b=%q", a, b)
+	}
+	if !strings.HasPrefix(a, "🎭 **TwinBee:**") {
+		t.Errorf("missing TwinBee prefix: %q", a)
+	}
+	// Different room index should typically yield a different line
+	// (chance of accidental collision is 1/N; with the Goblin+Generic
+	// pool that's tiny but theoretically possible — only assert prefix).
+	c := twinBeeLine(ZoneGoblinWarrens, GMRoomEntry, "abc123", 3)
+	if !strings.HasPrefix(c, "🎭 **TwinBee:**") {
+		t.Errorf("missing prefix on alt salt: %q", c)
+	}
+}
+
+func TestTwinBeeLine_BossEntryUsesNamedPool(t *testing.T) {
+	// Grol's pool is a single hand-crafted line.
+	got := twinBeeLine(ZoneGoblinWarrens, GMBossEntry, "any", 0)
+	if !strings.Contains(got, "Grol") {
+		t.Errorf("Goblin Warrens boss entry should mention Grol; got %q", got)
+	}
+	got = twinBeeLine(ZoneCryptValdris, GMBossEntry, "any", 0)
+	if !strings.Contains(got, "Valdris") {
+		t.Errorf("Crypt boss entry should mention Valdris; got %q", got)
+	}
+}
+
+func TestTwinBeeLine_UnknownKindReturnsEmpty(t *testing.T) {
+	if got := twinBeeLine(ZoneGoblinWarrens, GMNarrationType("not_a_real_kind"), "x", 0); got != "" {
+		t.Errorf("expected empty for unknown kind, got %q", got)
+	}
+}
+
+func TestApplyMoodEvent_PersistsClampedDelta(t *testing.T) {
+	setupAuditTestDB(t)
+	uid := id.UserID("@zone-mood-evt:example")
+	zoneCmdTestCharacter(t, uid, 1)
+	defer cleanupZoneRuns(uid)
+
+	run, err := startZoneRun(uid, ZoneGoblinWarrens, 1, nil)
+	if err != nil {
+		t.Fatalf("start: %v", err)
+	}
+	if run.GMMood != 50 {
+		t.Fatalf("starting mood = %d, want 50", run.GMMood)
+	}
+
+	// +10 → 60
+	got, err := applyMoodEvent(run.RunID, MoodEventZoneComplete)
+	if err != nil {
+		t.Fatalf("apply zone_complete: %v", err)
+	}
+	if got != 60 {
+		t.Errorf("after zone_complete: mood = %d, want 60", got)
+	}
+
+	// -20 → 40
+	got, _ = applyMoodEvent(run.RunID, MoodEventDowntime)
+	if got != 40 {
+		t.Errorf("after downtime: mood = %d, want 40", got)
+	}
+
+	// Clamp test: huge negative stack → 0
+	for i := 0; i < 20; i++ {
+		_, _ = applyMoodEvent(run.RunID, MoodEventDowntime)
+	}
+	r, _ := getZoneRun(run.RunID)
+	if r.GMMood != 0 {
+		t.Errorf("after extreme negative stack: mood = %d, want 0 (clamped)", r.GMMood)
+	}
+
+	// Clamp upward
+	for i := 0; i < 20; i++ {
+		_, _ = applyMoodEvent(run.RunID, MoodEventCommunityMilestone)
+	}
+	r, _ = getZoneRun(run.RunID)
+	if r.GMMood != 100 {
+		t.Errorf("after extreme positive stack: mood = %d, want 100 (clamped)", r.GMMood)
+	}
+}
+
+func TestApplyMoodEvent_UnknownEventErrors(t *testing.T) {
+	if _, err := applyMoodEvent("fake-run", GMMoodEvent("ghosts")); err == nil {
+		t.Error("expected error on unknown mood event")
+	}
+}
+
+func TestZoneCmd_AdvanceFinalRoomBumpsMood(t *testing.T) {
+	setupAuditTestDB(t)
+	uid := id.UserID("@zone-mood-complete:example")
+	zoneCmdTestCharacter(t, uid, 1)
+	defer cleanupZoneRuns(uid)
+
+	p := &AdventurePlugin{}
+	if err := p.handleDnDZoneCmd(MessageContext{Sender: uid}, "enter goblin_warrens"); err != nil {
+		t.Fatal(err)
+	}
+	run, _ := getActiveZoneRun(uid)
+	// Advance through every room. zone_complete fires on the boss-room
+	// advance and bumps mood by +10 (50 → 60).
+	for i := 0; i < run.TotalRooms; i++ {
+		if err := p.handleDnDZoneCmd(MessageContext{Sender: uid}, "advance"); err != nil {
+			t.Fatalf("advance %d: %v", i, err)
+		}
+	}
+	final, err := getZoneRun(run.RunID)
+	if err != nil || final == nil {
+		t.Fatal("could not fetch completed run")
+	}
+	if !final.BossDefeated {
+		t.Error("boss should be defeated after final advance")
+	}
+	if final.GMMood != 60 {
+		t.Errorf("post-completion mood = %d, want 60 (50 + zone_complete +10)", final.GMMood)
+	}
+}