J1: Extra Attack now fires in turn-based combat

The class-identity audit (98ba416) wired Extra Attack via the new
resolvePlayerSwings helper, but only SimulateCombat (auto-resolve)
called it. The turn-based engine — every !fight/!attack and every
elite/boss gate the sim drives via autoResolveCombat — still called
single-swing resolvePlayerAttack, so Fighter L11+ got 1 swing/turn at
the gates instead of 3. The audit close-out was correct in spirit but
half-applied.

J1 baseline matrix surfaced it: Fighter L12 cleared 100% of T2 forest
but 2% of T3 manor and 7% of T4 underdark, with %boss_reached at 100%
across the board. The wall was the boss-room damage exchange, not
mid-zone attrition. Trace dump on a sample fight: Fighter dealt 79
dmg in 14 rounds (7 hits / 9 swings) — exactly one swing per round —
versus 167 enemy dmg. With multi-swing wired in, the same fight ends
in 7 rounds with the boss dead, Fighter at 87/168 HP, 16 hits in 19
swings.

n=100 matrix after the fix:
  Fighter L12 manor:     2% → 100% clr
  Fighter L12 underdark: 7% → 98%  clr
  Fighter L12 forest:    94% → 100% (no leader regression)
Mage cells unchanged (J2 territory). Rogue cells within noise.

Sim infra changes that landed alongside (needed to read the J1
signal):

* expedition_sim auto-arms class-default defensive abilities
  (Second Wind / Healing Word) via the new simAutoArmEnabled toggle
  + trySimAutoArm helper, hooked before applyArmedAbility in both
  combat builders. Production code paths untouched (toggle stays
  off). Without this the sim simulated a player who never types
  !arm, which under-counts class survival.
* SimResult.Combats captures per-fight turn-log summaries (rounds,
  hits/misses, damage by side, AC values inferred from RollAgainst)
  so future J-phase questions can dig into the engine without
  re-running the matrix.
* sim_results/run_matrix.sh fans the matrix across (class,level,zone)
  cells via xargs -P (one process per cell — each owns its global
  sqlite handle). ~6× wall-clock speedup on a 14-core box; n=100
  matrix runs in ~3min.
* sim_results/summarize.sh gains p50_yld_clr + %boss_reached columns
  so future sweeps don't conflate "reaches boss" with "clears zone".

Baselines:
  sim_results/baseline_j0_n100.jsonl       — pre-fix (1350 rows)
  sim_results/baseline_j1_extra_attack.jsonl — post-fix (4500 rows)

Phase J state: J0 baseline locked, J1 done. T5 dragons_lair still
0% clear universally (J3). Mage T2+ wall still real (J2).

internal/plugin/combat_bridge.go

@@ -86,6 +86,7 @@ func (p *AdventurePlugin) runDungeonCombat(
 	applyRacePassives(&playerStats, &playerMods, dndChar)
 	applySubclassPassives(&playerStats, &playerMods, dndChar)
 	applyMagicItemEffects(&playerStats, &playerMods, userID)
+	trySimAutoArm(dndChar)
 	if firedName, fired := applyArmedAbility(dndChar, &playerMods); fired {
 		slog.Info("dnd: armed ability fired", "user", userID, "ability", firedName)
 	}

internal/plugin/combat_session_build.go

@@ -64,6 +64,7 @@ func (p *AdventurePlugin) buildZoneCombatants(
 	applyRacePassives(&playerStats, &playerMods, dndChar)
 	applySubclassPassives(&playerStats, &playerMods, dndChar)
 	applyMagicItemEffects(&playerStats, &playerMods, userID)
+	trySimAutoArm(dndChar)
 	if firedName, fired := applyArmedAbility(dndChar, &playerMods); fired {
 		slog.Info("dnd: armed ability fired (turn-based build)", "user", userID, "ability", firedName)
 	}

internal/plugin/combat_turn_engine.go

@@ -197,10 +197,18 @@ func (te *turnEngine) stepPlayerTurn(action PlayerAction) {
 		te.stepPlayerActionEffect(action.Effect)
 		return
 	}
-	// Default: weapon attack. resolvePlayerAttack returns true once the fight
-	// is decided — usually the enemy is down, but a retaliate aura can drop the
-	// player on their own swing, so disambiguate the outcome by HP.
-	if resolvePlayerAttack(te.st, te.player, te.enemy, &turnCombatPhase, te.result) {
+	// Default: weapon attack. resolvePlayerSwings rolls the base swing plus
+	// Mods.ExtraAttacks follow-ups (5e Extra Attack at Fighter L5/L11/L20,
+	// Ranger/Paladin L5, Bard College of Valor L7). One !attack press in the
+	// turn-based engine == one 5e Attack action == all swings in sequence.
+	// Before this, the turn path called single-swing resolvePlayerAttack and
+	// Extra Attack only fired in the auto-resolve SimulateCombat path; that
+	// left every elite/boss !fight at L11+ short two swings/turn, which the
+	// J1 boss-trace surfaced as Fighter's T3+ wall.
+	// Returns true once the fight is decided — usually the enemy is down,
+	// but a retaliate aura can drop the player on their own swing, so
+	// disambiguate the outcome by HP.
+	if resolvePlayerSwings(te.st, te.player, te.enemy, &turnCombatPhase, te.result) {
 		if te.st.playerHP <= 0 {
 			te.finish(CombatStatusLost)
 		} else {

internal/plugin/dnd_abilities.go

@@ -357,6 +357,59 @@ func displayAbility(id string) string {
 
 // ── Combat hook ──────────────────────────────────────────────────────────────
 
+// simAutoArmEnabled, when true, lets the combat builders pre-arm a
+// class-default ability for any character entering combat with an empty
+// ArmedAbility slot. The expedition-sim flips this on so synthetic
+// players model a competent real player (who would `!arm` Second Wind
+// before each fight) instead of a player who never touches the
+// !arm command. Untouched in production code paths.
+var simAutoArmEnabled = false
+
+// simAutoArmDefaultFor returns the class-default ability id the sim
+// should pre-arm. Defensive heals (Second Wind, Healing Word) only —
+// burning a Mage's spell slot every fight would mask J2, not help it.
+func simAutoArmDefaultFor(class DnDClass) string {
+	switch class {
+	case ClassFighter:
+		return "second_wind"
+	case ClassCleric:
+		return "healing_word"
+	}
+	return ""
+}
+
+// trySimAutoArm pre-arms the class-default ability if the global toggle
+// is on, no ability is currently armed, and the resource pool has at
+// least one charge. Mirrors handleDnDArmCmd's spend-and-save flow.
+// Returns the ability name (or "" when nothing was armed).
+func trySimAutoArm(c *DnDCharacter) string {
+	if !simAutoArmEnabled || c == nil || c.ArmedAbility != "" {
+		return ""
+	}
+	id := simAutoArmDefaultFor(c.Class)
+	if id == "" {
+		return ""
+	}
+	ab, ok := dndActiveAbilities[id]
+	if !ok {
+		return ""
+	}
+	cur, _, err := getResource(c.UserID, ab.Resource)
+	if err != nil || cur < 1 {
+		return ""
+	}
+	c.ArmedAbility = ab.ID
+	if err := SaveDnDCharacter(c); err != nil {
+		return ""
+	}
+	if ok, _ := spendResource(c.UserID, ab.Resource, 1); !ok {
+		c.ArmedAbility = ""
+		_ = SaveDnDCharacter(c)
+		return ""
+	}
+	return ab.Name
+}
+
 // applyArmedAbility checks for a pre-armed ability on the character and
 // applies its effect to the player's CombatModifiers, then clears the armed
 // flag. Called from combat_bridge.go before SimulateCombat.

internal/plugin/expedition_sim.go

@@ -12,6 +12,7 @@ package plugin
 // real-time waits.
 
 import (
+	"encoding/json"
 	"fmt"
 	"time"
 
@@ -35,6 +36,11 @@ func NewSimRunner(dataDir string) (*SimRunner, error) {
 	if err := db.Init(dataDir); err != nil {
 		return nil, fmt.Errorf("db init: %w", err)
 	}
+	// Synthetic players don't type !arm between fights; flip on the
+	// in-combat auto-arm so Fighter Second Wind, Cleric Healing Word,
+	// etc. fire the way a competent prod player would set them up.
+	// Without this the sim under-counts class survival.
+	simAutoArmEnabled = true
 	euro := &EuroPlugin{}
 	p := &AdventurePlugin{euro: euro}
 	return &SimRunner{P: p, Euro: euro}, nil
@@ -74,6 +80,12 @@ func (s *SimRunner) BuildCharacter(uid id.UserID, class DnDClass, level int) (*D
 	if err := SaveDnDCharacter(c); err != nil {
 		return nil, fmt.Errorf("SaveDnDCharacter: %w", err)
 	}
+	// Class resource pool (stamina/favor/focus/spell_slot). !setup writes
+	// this for prod players; the sim has to do it explicitly so Second
+	// Wind / Healing Word / etc. have a pool to draw from.
+	if err := initResources(uid, class); err != nil {
+		return nil, fmt.Errorf("initResources: %w", err)
+	}
 	if pool := slotsForClassLevel(class, level); len(pool) > 0 {
 		if err := setSpellSlotsForLevel(uid, class, level); err != nil {
 			return nil, fmt.Errorf("setSpellSlotsForLevel: %w", err)
@@ -231,7 +243,37 @@ type SimResult struct {
 	// adventure_inventory at end-of-run.
 	YieldCount    int
 	YieldsByName  map[string]int
-	Log           []SimLogEntry
+	// Combats holds a per-combat trace for every fight the synthetic
+	// player entered during the expedition (boss + elites + patrols).
+	// Used by post-hoc analysis to dig into class-survival walls
+	// without re-running the matrix. Populated from combat_sessions
+	// rows + their TurnLog at end-of-run.
+	Combats []SimCombatSummary
+	Log     []SimLogEntry
+}
+
+// SimCombatSummary is a compact per-fight trace: the entry stats, the
+// per-round damage dealt by each side, and the outcome. Lets J-phase
+// analysis ask "did Fighter L12 hit the manor boss often enough?"
+// without re-running the matrix.
+type SimCombatSummary struct {
+	SessionID    string
+	EncounterID  string
+	EnemyID      string
+	Status       string // active/won/lost/fled/expired
+	Rounds       int
+	PlayerHPMax  int
+	PlayerHPEnd  int
+	EnemyHPMax   int
+	EnemyHPEnd   int
+	PlayerDamage int // total damage dealt by player across the fight
+	EnemyDamage  int // total damage dealt by enemy across the fight
+	PlayerHits   int // d20 rolls by player that landed (>= enemy AC)
+	PlayerMisses int
+	EnemyHits    int
+	EnemyMisses  int
+	PlayerAC     int // inferred from RollAgainst on enemy attack events
+	EnemyAC      int // inferred from RollAgainst on player attack events
 }
 
 // SimLogEntry is a JSONL-friendly projection of one dnd_expedition_log
@@ -379,9 +421,77 @@ func (s *SimRunner) RunExpedition(uid id.UserID, zoneID ZoneID, walkCap int) (*S
 		}
 	}
 	res.YieldCount, res.YieldsByName = simMaterialYields(uid)
+	res.Combats = simCombatSummaries(uid)
 	return res, nil
 }
 
+// simCombatSummaries pulls every combat_sessions row for uid and folds
+// its TurnLog into a SimCombatSummary. AC values are inferred from the
+// RollAgainst column on attack events (the engine writes the defender's
+// AC there). Rows are ordered by started_at so the boss fight is last.
+func simCombatSummaries(uid id.UserID) []SimCombatSummary {
+	rows, err := db.Get().Query(`
+		SELECT session_id, encounter_id, enemy_id, status, round,
+		       player_hp, player_hp_max, enemy_hp, enemy_hp_max,
+		       turn_log_json
+		  FROM combat_session
+		 WHERE user_id = ?
+		 ORDER BY started_at ASC`, string(uid))
+	if err != nil {
+		return nil
+	}
+	defer rows.Close()
+	var out []SimCombatSummary
+	for rows.Next() {
+		var s SimCombatSummary
+		var turnLogJSON string
+		if err := rows.Scan(
+			&s.SessionID, &s.EncounterID, &s.EnemyID, &s.Status, &s.Rounds,
+			&s.PlayerHPEnd, &s.PlayerHPMax, &s.EnemyHPEnd, &s.EnemyHPMax,
+			&turnLogJSON); err != nil {
+			continue
+		}
+		var events []CombatEvent
+		if turnLogJSON != "" {
+			_ = json.Unmarshal([]byte(turnLogJSON), &events)
+		}
+		for _, ev := range events {
+			switch ev.Actor {
+			case "player":
+				if ev.Roll > 0 {
+					if ev.Damage > 0 {
+						s.PlayerHits++
+					} else {
+						s.PlayerMisses++
+					}
+					if ev.RollAgainst > s.EnemyAC {
+						s.EnemyAC = ev.RollAgainst
+					}
+				}
+				if ev.Damage > 0 {
+					s.PlayerDamage += ev.Damage
+				}
+			case "enemy":
+				if ev.Roll > 0 {
+					if ev.Damage > 0 {
+						s.EnemyHits++
+					} else {
+						s.EnemyMisses++
+					}
+					if ev.RollAgainst > s.PlayerAC {
+						s.PlayerAC = ev.RollAgainst
+					}
+				}
+				if ev.Damage > 0 {
+					s.EnemyDamage += ev.Damage
+				}
+			}
+		}
+		out = append(out, s)
+	}
+	return out
+}
+
 // simMaterialYields tallies the material rows the synthetic player
 // banked in adventure_inventory. One row per +1, so the count is the
 // raw resource-unit total. Map breakdown is keyed by resource name.