test: claim engine — reset requests never alter claimed state (Scenario C non-DoS; leftover from the claim-arc session)

Claude-Session: https://claude.ai/code/session_01NptTCFtu7dz2Ru89qHRagN

hub/internal/claim/engine_test.go

@@ -202,3 +202,30 @@ func TestIssue_EmailFailureKeepsGateArmed(t *testing.T) {
 		t.Fatalf("emailed_at must stay unset on failure: %+v", row)
 	}
 }
+
+// Reset non-DoS (Scenario C WRONG case): repeated reset REQUESTS never touch the box's password
+// or claimed state — the engine only rotates the CODE. The controller's password keeps working
+// throughout (the box side owns the password; the hub only mails codes). Red-proof partner: make
+// RequestReset also clear claimed_at → this fails.
+func TestRequestReset_NeverAltersClaimedState(t *testing.T) {
+	e, st, _ := newTestEngine(t)
+	if _, err := e.EnsureIssued(cust()); err != nil {
+		t.Fatalf("EnsureIssued: %v", err)
+	}
+	if err := e.MarkClaimed(cust()); err != nil {
+		t.Fatalf("MarkClaimed: %v", err)
+	}
+	claimedBefore, _ := st.GetClaim("c1")
+	for i := 0; i < 3; i++ {
+		if err := e.RequestReset(cust()); err != nil {
+			t.Fatalf("RequestReset %d: %v", i, err)
+		}
+	}
+	claimedAfter, _ := st.GetClaim("c1")
+	if !claimedAfter.Claimed() {
+		t.Fatal("reset requests un-claimed the box — must never happen")
+	}
+	if !claimedAfter.ClaimedAt.Equal(*claimedBefore.ClaimedAt) {
+		t.Fatal("reset requests moved claimed_at")
+	}
+}