The stone pierces walls for creations too (rules rev 3)

VISIONSTONE only ever lit the attack path: casterLos knew it, but
every sight check routed through gameLos — creations like THORNBUSH,
dispels, CREATE DOOR, STONE TO WATER — refused "no line of sight"
through the bearer's one wall. gameLos now honors the stone whenever
the viewer bears it, at every revision: widening what a cast may
target never changes how a recorded command replays, so games already
in flight get the fix at once. Only the ambush's mid-move eye is
frozen per game (rev 3) — springing lands in the ledger's flow, and
stored games must replay their blindness. All 18 production ledgers
verified; 272 engine tests.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015RCWSTnb1KYTPyL4GmhGnF

packages/engine/test/casting.test.ts

@@ -527,6 +527,25 @@ describe("the VISIONSTONE pierces one wall", () => {
     expect(cast.ok).toBe(true);
   });
 
+  it("its bearer plants a THORNBUSH through the wall", () => {
+    const { state, a } = stoneRig();
+    // The square past the wall must be bare ground for a creation.
+    const cell = { x: 2, y: 5 };
+    for (const p of state.players) if (cellKey(p.position) === cellKey(cell)) p.position = { x: 0, y: 0 };
+    const bush = giveCard(state, a.id, "thornbush", "TB");
+    const refused = applyCommand(state, a.id, {
+      type: "cast", instanceId: bush.instanceId, target: { kind: "cell", cell },
+    });
+    expect(refused.ok).toBe(false);
+    if (!refused.ok) expect(refused.error).toContain("line of sight");
+    const stone = giveCard(state, a.id, "visionstone", "VS", 1);
+    a.displayed.push(stone.instanceId);
+    const cast = applyCommand(state, a.id, {
+      type: "cast", instanceId: bush.instanceId, target: { kind: "cell", cell },
+    });
+    expect(cast.ok).toBe(true);
+  });
+
   it("the client's sighted squares agree with the stone", () => {
     const { state, a, b } = stoneRig();
     expect(sightedCellsFor(viewFor(state, a.id)).has(cellKey(b.position))).toBe(false);