Rev 17: a warp mouth on a pit's rim is a way off it (M4Q7)

Kestrel stood beside a pit dug against the board's west edge, walls
north and south of it, and was told there was nothing to land on — the
rim check counted only neighbouring squares, and the warp mouth beyond
the pit is not one. From rev 17 a mouth on the rim is an exit like any
square, named at a fork like any other; every older game takes the
mouth when no square offers, so the refused crossing goes through as
it stands. The jump through a mouth carries `via: "warp"`: the board
shimmers both mouths instead of streaking across the maze, and the
reel cuts rather than gliding. The automaton leaves a pit only by its
exits. Three tests walk the rim under both readings.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Jm2auWk6RP71CjaAb4FMoG

packages/web/src/App.svelte

@@ -941,8 +941,8 @@
       if (view.squareContents[cellKey(pit)]?.kind !== "pit") continue;
       for (const out of SIDES) {
         if (out === (side === "N" ? "S" : side === "S" ? "N" : side === "E" ? "W" : "E")) continue;
-        const land = { x: pit.x + (out === "E" ? 1 : out === "W" ? -1 : 0), y: pit.y + (out === "S" ? 1 : out === "N" ? -1 : 0) };
-        if (cellKey(land) === cellKey(cell)) { tryMove(side, undefined, out); return; }
+        const foot = stepTarget(view.board, pit, out);
+        if (foot.kind !== "blocked" && cellKey(foot.to) === cellKey(cell)) { tryMove(side, undefined, out); return; }
       }
     }
     // BIG MAN: clicking two squares away over a pit/tacks/ooze leaps it.

packages/web/src/fpv/director.ts

@@ -133,7 +133,7 @@ export function hurledIn(events: GameEvent[], povId: string): boolean {
   // and straight, eyes ahead — never a cut that reads as a teleport.
   return events.some((e) =>
     (e.type === "knockedBack" || e.type === "shoved" || e.type === "washedBack" ||
-     e.type === "retreatedInHorror" || e.type === "jumpedPit") && e.player === povId);
+     e.type === "retreatedInHorror" || (e.type === "jumpedPit" && e.via !== "warp")) && e.player === povId);
 }
 
 export interface Glide {

packages/web/src/fx.ts

@@ -266,7 +266,13 @@ export function fxForEvents(
         beat++;
         break;
       case "jumpedPit":
-        push({ kind: "streak", a: wizMid(e.from), b: anchorAt(e.to, e.player) });
+        if (e.via === "warp") {
+          // Off the rim through a warp mouth: the mouths shimmer, as for a step.
+          push({ kind: "portal-cell", at: e.from });
+          push({ kind: "portal-cell", at: e.to }, 150);
+        } else {
+          push({ kind: "streak", a: wizMid(e.from), b: anchorAt(e.to, e.player) });
+        }
         beat++;
         break;
       case "fellInPit":