The simulator can be read now, not just totalled (R-263)

Every guard here reports a number per creature, and a number cannot say why a fight went
the way it did. That gap is what produced R-258 through R-260: each written from a side
harness built to watch a fight, each modelling something slightly different from the game,
two of the three wrong in ways no guard could catch because no guard was involved.

runFight takes an optional `say` sink. It reports what the simulator already decided — the
attack roll and its target, a defence and the penalty it was made at, the landing level
after a dodge downgrades it, damage against armour before and after armourAgainst, the
location, major wounds, disablement, death. It never touches the generator, so a narrated
fight and a silent one are the same fight; check-lethality and check-focus both still
match their baselines exactly with the hook in place.

tools/playthrough.mjs (npm run play) is its consumer, in the same commit deliberately: a
hook with no reader is the exact defect this project keeps finding in its own rules, and
adding one to the measurement pipeline with only a scratchpad file calling it would have
been committing the thing I have spent the session removing. Pack size comes from
focus-baseline.json so the fight you read is the fight check-focus measures; creatures
recorded as pinned are played solo.

Three redcaps, seed 20260913, same seed both ways. Spread fire: wiped in 10 rounds, 3
dead, and all three redcaps still standing — 39 hit points spread three ways so that none
of it finished anything. Focus fire: same opening, diverging at one target choice in round
1, party wins in 20 with two up. The +13.2 points check-focus records, seen once instead
of averaged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

package.json

@@ -8,6 +8,7 @@
     "icons": "node tools/make-icons.mjs",
     "portraits": "node tools/make-portraits.mjs",
     "bestiary": "node tools/bestiary.mjs",
+    "play": "node tools/playthrough.mjs",
     "mj": "node tools/mj-queue.mjs",
     "simulate": "node tools/simulate.mjs",
     "check": "bun tools/check-rules.mjs && bun tools/check-kits.mjs && bun tools/check-lang.mjs && bun tools/check-templates.mjs && bun tools/check-behaviour.mjs && bun tools/check-scenarios.mjs && bun tools/check-rollable.mjs && bun tools/check-creatures.mjs && bun tools/check-anatomy.mjs && bun tools/check-lethality.mjs && bun tools/check-focus.mjs && bun tools/check-bestiary.mjs",