Reflected permanent curses return to their caster (rules rev 11)

SLOW DEATH, WALKING DEAD, and IDIOT ride no damage or duration pipe, so
a FULL REFLECTION used to evaporate them; per the FAQ reflections act on
the cast, so the returned curse now opens its stack against the caster
like any reflected spell. Marked permanentCurse on the three defs; older
ledgers keep the evaporation.

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

packages/engine/test/stones.test.ts

@@ -170,6 +170,26 @@ describe("slow death", () => {
     expect(state.players.find((p) => p.id === defender)!.life).toBe(17);
   });
 
+  it("a full reflection returns the curse onto its caster (rev 11)", () => {
+    let { state } = newGame();
+    state = toRound2(state);
+    const { attacker, defender } = faceOff(state);
+    const sd = giveCard(state, attacker, "slow-death");
+    giveCard(state, defender, "full-reflection", "FR", 0);
+    const r = applyCommand(state, attacker, {
+      type: "cast", instanceId: sd.instanceId, target: { kind: "player", playerId: defender },
+    });
+    if (!r.ok) throw new Error(r.error);
+    state = must(r.state, defender, { type: "counteract", instanceId: "full-reflection#FR" });
+    state = drain(state);
+    expect(sustainedOn(state, defender, "slow-death").length).toBe(0);
+    expect(sustainedOn(state, attacker, "slow-death").length).toBe(1);
+
+    // The caster now bleeds for their own draws.
+    state = must(state, attacker, { type: "endTurn", draw: 1 });
+    expect(state.players.find((p) => p.id === attacker)!.life).toBe(14);
+  });
+
   it("older decks attach the biting curse through a reverse (rev ≤10)", () => {
     let { state } = createGame({ playerIds: ["alice", "bob"], seed: 42, sets: ["basic"], deckRev: 10 });
     state = toRound2(state);