fleetd #663: remove the dead legacy assertion review flagged on PR 665

noEffectiveWindowFallsBackToTheFixed200000Default's third assertion
(legacyConfigDir/legacyGauge) used to call the 3-arg read() to prove
it behaved like a null window. With the 3-arg form gone, it is the
same call, same input (200_000) and same expectation as the atGauge
assertion above it, so it cannot fail unless that one already failed,
and its message named a method that no longer exists. Deleted it; the
first two assertions (199_999 -> OK, 200_000 -> HIGH) are unchanged.

fleetd/src/test/java/dev/ltms/fleet/lead/LeadContextGaugeHighThresholdTest.java

@@ -81,12 +81,6 @@ class LeadContextGaugeHighThresholdTest {
         assertEquals(LeadContextGauge.State.HIGH,
                 atGauge.read(atConfigDir, SESSION_ID, "claude", null).state(),
                 "the fixed default must still be 200,000 when no window is resolvable");
-
-        String legacyConfigDir = writeTranscript(tmp.resolve("legacy"), SESSION_ID, 200_000);
-        LeadContextGauge legacyGauge = new LeadContextGauge();
-        assertEquals(LeadContextGauge.State.HIGH,
-                legacyGauge.read(legacyConfigDir, SESSION_ID, "claude", null).state(),
-                "the 3-arg read() (no window argument at all) must behave exactly like passing a null window");
     }
 
     @Test