Credibility pass: the seams get sanded

Scoped to everything since the last pass (3308850). Three blind
reviews, every finding verified before touching anything.

Confirmed and fixed: two identical comment-splitting insertions left
doc comments orphaned from their fields (net and local alike); a
51-line CSS fossil of the pre-extraction inline effects survived in
Board.svelte; the rev-13 miss-roll test asserted tautologies while
its comment claimed a check the code never made — it now proves the
die was consumed, and the skeleton is no longer returned as trollId;
the sprite registry's `as never` silently disabled the completeness
its annotation advertised (now a mapped type, one cast at the
dispatch seam); a dead ternary guarded a union that doesn't exist;
Bolt carried a duplicate .fork rule from a color iteration; fxTtl
contradicted three sprites' real animation lengths; the permanence
sentinel was reinvented as a magic 9000 (the engine now exports
isPermanentDuration); CELL was declared thrice (fx.ts now imports
it); App and Replay ran two divergent fx schedulers (one scheduleFx
now, cancellable — stale flourishes can no longer fire after leaving
a game); TokenArt retried missing files forever; the anti-anti
escape guards merge with the gate asymmetry explained; wall-of-fire's
rev-12 carve-out is marked; overLimit ignored a displayed BRAINSTONE
(bots over-discarded by two); botRemark's header mis-stated its own
branches; deliverGold fired on any drop, not a home-base delivery;
escape and win banter never fired from the steps that carry them.

Rejected: "as a human would" (house voice); FxGallery's dev-harness
framing (trimmed one plea, kept the facts).

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

packages/web/src/fx.ts

@@ -9,12 +9,12 @@ type Cell = { x: number; y: number };
 type Pt = { x: number; y: number };
 type Side = "N" | "E" | "S" | "W";
 
-const CELL = 48;
+import { CELL } from "./fx-sprites/geom";
 const cellMid = (c: Cell): Pt => ({ x: c.x * CELL + CELL / 2, y: c.y * CELL + CELL / 2 });
 /** Where a wizard token's center sits in a cell (mirrors Board.svelte). */
 const wizMid = (c: Cell): Pt => ({ x: c.x * CELL + CELL / 2, y: c.y * CELL + CELL * 0.36 });
 
-type FxShape =
+export type FxShape =
   | { kind: "fireball" | "bolt" | "waterbolt" | "streak"; a: Pt; b: Pt }
   | { kind: "burst" | "splash" | "shimmer" | "shield" | "sparkle" | "whiff" | "hit"
       | "pow" | "claw" | "absorb" | "portal-cell" | "soul" | "fireworks" | "chaos-swirl"
@@ -134,7 +134,7 @@ export function fxForEvents(
         break;
       case "creatureAttacked": {
         // The target may be a wizard or a fellow creature.
-        const at = posOf(typeof e.target === "string" ? e.target : null) ??
+        const at = posOf(e.target) ??
           (() => {
             const c = view.creatures.find((c) => c.id === e.target);
             return c ? { ...c.position } : null;
@@ -306,3 +306,24 @@ export function fxForEvents(
   }
   return out;
 }
+
+/** Schedule a batch's effects into `add`, expiring each after its run.
+ * Returns a cancel that stops pending starts and sweeps what began. */
+export function scheduleFx(
+  events: GameEvent[], view: GameView,
+  add: (fx: BoardFx) => void, remove: (id: number) => void,
+): () => void {
+  const timers: ReturnType<typeof setTimeout>[] = [];
+  const started: number[] = [];
+  for (const { fx, delay } of fxForEvents(events, view)) {
+    timers.push(setTimeout(() => {
+      started.push(fx.id);
+      add(fx);
+      timers.push(setTimeout(() => remove(fx.id), fxTtl(fx.kind)));
+    }, delay));
+  }
+  return () => {
+    timers.forEach(clearTimeout);
+    started.forEach(remove);
+  };
+}