Credibility pass: the illusion tests roll both ways, and the seams from the last batch are sanded

Scope: 66b5c06..HEAD.

- The rev-27 illusion tests search seeds for a believed and a doubted
  roll and assert fixed life totals; seed 42 alone never believed, so
  the BLUNT pricing went unchecked.
- Three docblocks stranded above newly inserted functions are back on
  their own (openCreatureStack, resolvedBlow, castTrace).
- POWER ATTACK's life trade is one helper instead of three copies; the
  goat's charge distance is one helper for its validator, its ram and
  its pricing.
- The family list loads once into a shared store; the lobby and gallery
  share one talk filter; Board uses the engine's neighbor().
- A creature's blow shows the card that summoned it by the creature's
  kind, not by matching the blow's display name.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG

packages/engine/test/expansion-combat.test.ts

@@ -942,8 +942,8 @@ describe("the goat's ram is a physical blow like any other (rev 26)", () => {
 
 describe("an illusion is priced as the spell it fakes (rev 27)", () => {
   /** A faked FIREBALL met by the given counteraction, then both wizards pass. */
-  function fakedFireball(counter: string | null, deckRev?: number) {
-    let { state } = createGame({ playerIds: ["liar", "mark"], seed: 42, sets: ["basic", "expansion1"], ...(deckRev ? { deckRev } : {}) });
+  function fakedFireball(counter: string | null, deckRev?: number, seed = 42) {
+    let { state } = createGame({ playerIds: ["liar", "mark"], seed, sets: ["basic", "expansion1"], ...(deckRev ? { deckRev } : {}) });
     state = toRound2(state);
     const { attacker, defender } = faceOff(state);
     const ill = giveCard(state, attacker, "illusionary-attack");
@@ -965,11 +965,22 @@ describe("an illusion is priced as the spell it fakes (rev 27)", () => {
     return { events: done.events, believed, life: done.state.players.find((p) => p.id === defender)!.life };
   }
 
+  /** The first seed whose die comes up each way: one believed, one disbelieved. */
+  function bothWays(counter: string | null, deckRev?: number) {
+    const found: Partial<Record<"believed" | "doubted", ReturnType<typeof fakedFireball>>> = {};
+    for (let seed = 1; seed <= 40 && !(found.believed && found.doubted); seed++) {
+      const r = fakedFireball(counter, deckRev, seed);
+      expect(r.believed).not.toBeNull();
+      found[r.believed ? "believed" : "doubted"] ??= r;
+    }
+    return { believed: found.believed!, doubted: found.doubted! };
+  }
+
   it("BLUNT halves a believed fake fireball to three, and disbelief costs nothing", () => {
-    const { events, believed, life } = fakedFireball("blunt");
-    expect(believed).not.toBeNull();
-    expect(events).toContainEqual(expect.objectContaining({ type: "attackResolved", incoming: 5 }));
-    expect(life).toBe(believed ? 12 : 15);
+    const { believed, doubted } = bothWays("blunt");
+    expect(believed.events).toContainEqual(expect.objectContaining({ type: "attackResolved", incoming: 5 }));
+    expect(believed.life).toBe(12);
+    expect(doubted.life).toBe(15);
   });
 
   it("FULL SHIELD stops the fake outright: nothing to believe in, no die rolled", () => {
@@ -980,14 +991,10 @@ describe("an illusion is priced as the spell it fakes (rev 27)", () => {
   });
 
   it("uncountered, a believed fake fireball still does its five", () => {
-    const { believed, life } = fakedFireball(null);
-    expect(believed).not.toBeNull();
-    expect(life).toBe(believed ? 10 : 15);
+    expect(bothWays(null).believed.life).toBe(10);
   });
 
   it("older games dealt a believed illusion's full points past a BLUNT", () => {
-    const { believed, life } = fakedFireball("blunt", 26);
-    expect(believed).not.toBeNull();
-    expect(life).toBe(believed ? 10 : 15);
+    expect(bothWays("blunt", 26).believed.life).toBe(10);
   });
 });