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).

sim_results/run_matrix.sh

@@ -0,0 +1,80 @@
+#!/usr/bin/env bash
+# Parallel driver for cmd/expedition-sim matrix sweeps.
+#
+# Spawns one expedition-sim process per (class, level, zone) cell, so each
+# worker owns its own global sqlite handle (NewSimRunner closes+reinits the
+# package-level db.Get() — workers in the same process would clobber each
+# other). All worker stdouts are concatenated into a single JSONL.
+#
+# Usage:
+#   run_matrix.sh OUTFILE RUNS CLASSES LEVELS ZONES [PARALLEL]
+#
+# Example (1350 rows, 14-way parallel):
+#   run_matrix.sh baseline_j0.jsonl 30 \
+#     fighter,mage,rogue 3,7,12 \
+#     goblin_warrens,forest_shadows,manor_blackspire,underdark,dragons_lair
+set -euo pipefail
+
+outfile=${1:?outfile required}
+runs=${2:?runs required}
+classes=${3:?classes required}
+levels=${4:?levels required}
+zones=${5:?zones required}
+parallel=${6:-$(nproc)}
+
+repo=$(cd "$(dirname "$0")/.." && pwd)
+bin=$repo/expedition-sim
+[[ -x "$bin" ]] || { echo "missing $bin — run 'go build ./cmd/expedition-sim' first" >&2; exit 1; }
+
+cd "$repo/sim_results"
+tmpdir=$(mktemp -d -t simrun-XXXXXX)
+trap 'rm -rf "$tmpdir"' EXIT
+
+errfile=${outfile%.jsonl}.err
+: > "$outfile"
+: > "$errfile"
+
+# Enumerate cells one per line: "class level zone".
+cells=$tmpdir/cells.txt
+IFS=, read -ra cls <<< "$classes"
+IFS=, read -ra lvs <<< "$levels"
+IFS=, read -ra zns <<< "$zones"
+for c in "${cls[@]}"; do
+  for l in "${lvs[@]}"; do
+    for z in "${zns[@]}"; do
+      printf "%s\t%s\t%s\n" "$c" "$l" "$z"
+    done
+  done
+done > "$cells"
+
+ncells=$(wc -l < "$cells")
+echo "matrix: $ncells cells × $runs runs = $((ncells * runs)) rows, $parallel workers" >&2
+
+# Fan out: one process per cell. Per-cell stdout goes to its own shard,
+# stderr is collected to the shared errfile.
+worker() {
+  local class=$1 level=$2 zone=$3
+  local shard=$tmpdir/$class-$level-$zone.jsonl
+  "$bin" -matrix \
+    -classes "$class" -levels "$level" -zones "$zone" \
+    -runs "$runs" \
+    > "$shard" 2>> "$errfile"
+}
+export -f worker
+export bin tmpdir runs errfile
+
+xargs -P "$parallel" -L 1 -a "$cells" bash -c 'worker "$@"' _
+
+# Stitch shards in deterministic order (zone, class, level — matches
+# summarize.sh's sort_by) so diff-friendliness survives parallel arrival.
+for c in "${cls[@]}"; do
+  for l in "${lvs[@]}"; do
+    for z in "${zns[@]}"; do
+      shard=$tmpdir/$c-$l-$z.jsonl
+      [[ -f "$shard" ]] && cat "$shard" >> "$outfile"
+    done
+  done
+done
+
+rows=$(wc -l < "$outfile")
+echo "wrote $rows rows → $outfile (errors in $errfile)" >&2

sim_results/summarize.sh

@@ -1,38 +1,51 @@
 #!/usr/bin/env bash
-# Aggregate h4_baseline.jsonl into a per-(class,level,zone) table.
-# Columns: class, level, zone, n, p50 yield, mean yield, mean rooms, %cleared, %tpk, %fled, %extracted.
+# Aggregate a sim corpus JSONL into a per-(class,level,zone) table.
+# Columns: class, level, zone, n, p50 yield (all), p50 yield among cleared,
+# mean yield, mean rooms, %cleared, %boss-reached, %tpk, %fled, %extracted.
+#
+# boss-reached counts runs whose StopCode is "boss" or "complete" — i.e.,
+# the autopilot entered the boss room, whether the run died there or
+# finished the zone.
 set -euo pipefail
 
-infile=${1:-h4_baseline.jsonl}
+infile=${1:-baseline_j0.jsonl}
 cd "$(dirname "$0")"
 
 jq -rs '
+  def p50(xs): if (xs|length)==0 then 0 else (xs|sort|.[(length/2|floor)]) end;
+
   group_by([.Class, .Level, .Zone])
   | map({
-      class:  .[0].Class,
-      level:  .[0].Level,
-      zone:   .[0].Zone,
-      n:      length,
-      yields: [.[] | .YieldCount],
-      rooms:  [.[] | .Rooms],
-      outcomes: [.[] | .Outcome]
+      class:    .[0].Class,
+      level:    .[0].Level,
+      zone:     .[0].Zone,
+      n:        length,
+      yields:   [.[] | .YieldCount],
+      yields_cleared: [.[] | select(.Outcome=="cleared") | .YieldCount],
+      rooms:    [.[] | .Rooms],
+      outcomes: [.[] | .Outcome],
+      stops:    [.[] | .StopCode]
     })
   | map(. + {
-      p50_yield:  (.yields | sort | .[(length/2|floor)]),
-      mean_yield: ((.yields | add) / length),
-      mean_rooms: ((.rooms  | add) / length),
-      pct_cleared:   (([.outcomes[] | select(. == "cleared")]   | length) * 100 / .n),
-      pct_tpk:       (([.outcomes[] | select(. == "tpk")]       | length) * 100 / .n),
-      pct_fled:      (([.outcomes[] | select(. == "fled")]      | length) * 100 / .n),
-      pct_extracted: (([.outcomes[] | select(. == "extracted")] | length) * 100 / .n)
+      p50_yield:         p50(.yields),
+      p50_yield_cleared: p50(.yields_cleared),
+      mean_yield:        ((.yields | add) / .n),
+      mean_rooms:        ((.rooms  | add) / .n),
+      pct_cleared:       (([.outcomes[] | select(. == "cleared")]   | length) * 100 / .n),
+      pct_boss_reached:  (([.stops[]    | select(. == "boss" or . == "complete")] | length) * 100 / .n),
+      pct_tpk:           (([.outcomes[] | select(. == "tpk")]       | length) * 100 / .n),
+      pct_fled:          (([.outcomes[] | select(. == "fled")]      | length) * 100 / .n),
+      pct_extracted:     (([.outcomes[] | select(. == "extracted")] | length) * 100 / .n)
     })
   | sort_by(.zone, .class, .level)
-  | (["class","level","zone","n","p50_yld","mean_yld","mean_rms","%clr","%tpk","%fled","%ext"] | @tsv),
-    (.[] | [.class, .level, .zone, .n, .p50_yield,
+  | (["class","level","zone","n","p50_yld","p50_yld_clr","mean_yld","mean_rms","%clr","%boss","%tpk","%fled","%ext"] | @tsv),
+    (.[] | [.class, .level, .zone, .n,
+            .p50_yield, .p50_yield_cleared,
             (.mean_yield * 10 | round / 10),
             (.mean_rooms * 10 | round / 10),
-            (.pct_cleared   | round),
-            (.pct_tpk       | round),
-            (.pct_fled      | round),
-            (.pct_extracted | round)] | @tsv)
+            (.pct_cleared      | round),
+            (.pct_boss_reached | round),
+            (.pct_tpk          | round),
+            (.pct_fled         | round),
+            (.pct_extracted    | round)] | @tsv)
 ' "$infile" | column -t -s $'\t'