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/net.svelte.ts

@@ -250,11 +250,11 @@ class Net {
   transferCode = $state<{ code: string; expiresAt: number } | null>(null);
   /** Moves you haven't watched yet in the current room. */
   missedMoves = $state(0);
-  /** A catch-up reel delivered by the server. */
   /** The opening roll-off, shown once as the boards flip. */
   openingRolls = $state<{ rolls: Record<string, number[]>; first: string; players: string[] } | null>(null);
   /** Board flourishes: the app hooks in to animate live event batches. */
   onFx: ((events: GameEvent[]) => void) | null = null;
+  /** A catch-up reel delivered by the server. */
   catchUp = $state<{ seq: number; actor: string; events: GameEvent[]; view: GameView; chat?: { player: string; text: string }[] }[] | null>(null);
   private seen: Record<string, number> = loadSeen();
   /** Room whose live stream this connection has already shown once: states
@@ -326,8 +326,8 @@ class Net {
             // Only the FIRST state after arriving carries a gap worth
             // announcing. Later states were watched live: a caught-up
             // watcher stays caught up, and an announced gap stays FROZEN
-            // (not grown, not wiped) until watched or skipped. A hidden
-            // tab accumulates its gap honestly.
+            // until watched or skipped. A hidden tab accumulates its gap
+            // honestly.
             if (this.watching === this.roomId && document.visibilityState === "visible") {
               if (this.missedMoves === 0) this.markSeen();
             } else {