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/FxGallery.svelte

@@ -1,9 +1,10 @@
 <script lang="ts">
   // The flourish workshop: every effect sprite on a loop, labeled, against a
   // mini-maze. Open with /?fx while `npm run dev` runs — edits to any sprite
-  // file hot-reload here mid-animation. Not linked from anywhere; harmless.
+  // file hot-reload here mid-animation.
+  import type { Component } from "svelte";
   import { FX_SPRITES } from "./fx-sprites";
-  import type { BoardFx } from "./fx";
+  import type { BoardFx, FxShape } from "./fx";
 
   let tick = $state(0);
   $effect(() => {
@@ -42,7 +43,7 @@
     { kind: "edge-dust", cell: mid, side: "S" },
     { kind: "sector-spin", origin: { x: 0, y: 0 }, clockwise: true },
     { kind: "sector-slide", from: { x: 0, y: 0 }, to: { x: 1, y: 0 } },
-  ] as unknown as BoardFx[]).map((f, i) => ({ ...f, id: i + 1 }));
+  ] as FxShape[]).map((f, i): BoardFx => ({ ...f, id: i + 1 }));
 
   const isSector = (k: string) => k.startsWith("sector-");
 </script>
@@ -55,7 +56,7 @@
   </p>
   <div class="grid">
     {#each SAMPLES as fx (fx.kind)}
-      {@const Sprite = FX_SPRITES[fx.kind]}
+      {@const Sprite = FX_SPRITES[fx.kind] as Component<{ fx: BoardFx }>}
       <figure>
         <svg viewBox={isSector(fx.kind) ? "-4 -4 296 296" : "-4 -4 152 152"}>
           {#each Array.from({ length: isSector(fx.kind) ? 6 : 3 }, (_, cy) => cy) as cy (cy)}
@@ -64,7 +65,7 @@
             {/each}
           {/each}
           {#key tick}
-            <g class="fx-layer"><Sprite fx={fx as never} /></g>
+            <g class="fx-layer"><Sprite {fx} /></g>
           {/key}
         </svg>
         <figcaption>{fx.kind}</figcaption>