fleetd #494 follow-up: print the measured nudge count, and fix the sibling turn-settle timeout line

- waitForClearPickupAndSettle's grace-release warn now prints the measured 'nudges' counter
  instead of the constant PICKUP_GRACE_POLLS - 1. The two happen to agree today, but the
  constant expression was wrong once before (printed PICKUP_GRACE_POLLS itself, claiming 8
  nudges where 7 went out) and a code read did not catch it — only a mutation test did.
  Printing the counter cannot drift from the loop's real behaviour.
- waitUntilAtTurnBoundary (the FIRST wait, ~line 386-391) had the identical 'configured value
  printed as if measured' defect as the three lines fixed in the original #494 commit, but was
  out of scope because the brief named specific lines instead of the shape. Fixed the same way:
  it now returns a TurnSettleResult(settled, elapsedMillis) instead of a bare boolean, and the
  timeout warn prints 'configured={}s elapsed={}ms' instead of presenting cfg.turnSettleSeconds()
  as the measured wait.
- No behaviour change: same sends, same order, same release/refuse decisions.
- Test additions: clearGraceReleaseLogIsWarnWithMeasuredElapsed now also asserts the measured
  nudge count; successLogPrintsMeasuredElapsedForTheWholeRoll's expected elapsed value is
  updated (7000ms, not 6500ms) to account for waitUntilAtTurnBoundary's own new clock read; a
  new turnTimeoutLogPrintsMeasuredElapsedNotJustConfigured test pins the sibling line.
- Proved the nudges fix with a temporary mutation: set PICKUP_GRACE_POLLS to 5, confirmed via
  two greps that the mutant applied and the original constant was gone, ran the grace-release
  test and read the actual log line — nudge count followed to 4 (= 5 - 1), then restored to 8
  and reran the full LeadRolloverTest suite as a control (33/33 green).

fleetd/src/main/java/dev/ltms/fleet/lead/LeadRollover.java

@@ -382,13 +382,17 @@ public final class LeadRollover {
     private void runRollover(PendingRollover p, FleetConfig.LeadRollover cfg) {
         String lead = p.leadTerminal();
         long rollStartMillis = nowMillis.getAsLong();
-        boolean turnSettled = waitUntilAtTurnBoundary(lead, cfg.turnSettleSeconds());
-        if (!turnSettled) {
-            log.warn("lead-rollover: pane {} did not reach a turn boundary (IDLE or DONE) within {}s "
-                            + "after confirm() — refusing to send /clear at all; the calling lead's "
-                            + "own turn is still live and clearing it now would destroy live context "
-                            + "(token={})",
-                    lead, cfg.turnSettleSeconds(), p.token());
+        TurnSettleResult turnResult = waitUntilAtTurnBoundary(lead, cfg.turnSettleSeconds());
+        if (!turnResult.settled()) {
+            // fleetd #494 follow-up: this line had the SAME defect as the /clear-timeout line below
+            // — cfg.turnSettleSeconds() is the CONFIGURED budget, not how long this wait actually
+            // ran. Print the measured elapsed time alongside it, labelled, exactly like the /clear
+            // path already does.
+            log.warn("lead-rollover: pane {} did not reach a turn boundary (IDLE or DONE) after "
+                            + "confirm() — refusing to send /clear at all; the calling lead's own "
+                            + "turn is still live and clearing it now would destroy live context "
+                            + "(token={}, configured={}s elapsed={}ms)",
+                    lead, p.token(), cfg.turnSettleSeconds(), turnResult.elapsedMillis());
             return;
         }
 
@@ -483,9 +487,15 @@ public final class LeadRollover {
      * gate exists to prevent. Do not "simplify" this back to {@code injectable()}. ({@link
      * #waitForClearPickupAndSettle} keeps the same exclusion of {@code BLOCKED}, for the same
      * reason, on the second wait.)
+     *
+     * @return a {@link TurnSettleResult} whose {@code settled()} is {@code true} once a real
+     *         boundary was observed, {@code false} if {@code settleSeconds} elapses first.
+     *         {@code elapsedMillis()} is a MEASURED value from the injected {@link #nowMillis}
+     *         clock, never the configured {@code settleSeconds} budget (fleetd #494 follow-up).
      */
-    private boolean waitUntilAtTurnBoundary(String target, int settleSeconds) {
-        long deadline = nowMillis.getAsLong() + TimeUnit.SECONDS.toMillis(settleSeconds);
+    private TurnSettleResult waitUntilAtTurnBoundary(String target, int settleSeconds) {
+        long startMillis = nowMillis.getAsLong();
+        long deadline = startMillis + TimeUnit.SECONDS.toMillis(settleSeconds);
         while (nowMillis.getAsLong() < deadline) {
             AgentStatus status;
             try {
@@ -496,13 +506,20 @@ public final class LeadRollover {
                 status = null;
             }
             if (status == AgentStatus.IDLE || status == AgentStatus.DONE) {
-                return true;
+                return new TurnSettleResult(true, nowMillis.getAsLong() - startMillis);
             }
             settleSleeper.run();
         }
-        return false;
+        return new TurnSettleResult(false, nowMillis.getAsLong() - startMillis);
     }
 
+    /**
+     * The measured outcome of {@link #waitUntilAtTurnBoundary} — fleetd #494 follow-up. The sibling
+     * of {@link ClearSettleResult} for the FIRST wait, which never nudges, so it carries no nudge
+     * count.
+     */
+    private record TurnSettleResult(boolean settled, long elapsedMillis) {}
+
     /**
      * The SECOND wait in {@link #runRollover} — after {@code /clear} has been sent, waits for it to
      * settle, bounded by {@code settleSeconds}. <strong>fleetd #489 — the paste-race fix.</strong>
@@ -587,10 +604,19 @@ public final class LeadRollover {
                     // also exactly the case that reported false success in the real incident (the
                     // whole roll "succeeded" after 438ms of a 20s budget), so raise it to WARN and
                     // print the MEASURED elapsed time next to the target pane, not just the count.
+                    //
+                    // fleetd #494 follow-up: the nudge count printed here must be the MEASURED
+                    // `nudges` counter, never the constant `PICKUP_GRACE_POLLS - 1` — the constant
+                    // happens to equal it today (this branch only fires after exactly
+                    // PICKUP_GRACE_POLLS - 1 nudges), but a mutation test caught this exact
+                    // expression once already printing the wrong constant (PICKUP_GRACE_POLLS
+                    // itself, claiming 8 nudges where 7 went out) and a plain code read did not
+                    // catch it. Printing the counter cannot drift from the loop's real behaviour,
+                    // whatever changes later to PICKUP_GRACE_POLLS or the loop itself.
                     log.warn("lead-rollover: /clear on {} was never observed as WORKING after {} "
                                     + "consecutive IDLE/DONE polls ({} of those were nudged) — "
                                     + "releasing rather than wedging the roll (elapsed={}ms)",
-                            target, PICKUP_GRACE_POLLS, PICKUP_GRACE_POLLS - 1, elapsedMillis);
+                            target, PICKUP_GRACE_POLLS, nudges, elapsedMillis);
                     return new ClearSettleResult(true, elapsedMillis, nudges);
                 }
                 try {

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

@@ -971,6 +971,14 @@ class LeadRolloverTest {
             assertTrue(message.contains("elapsed=4500ms"), "must print the MEASURED elapsed time — "
                     + "with this fixture's advancing clock, the wait ran 4500ms before releasing: "
                     + message);
+            // fleetd #494 follow-up: the nudge count in this line must be the MEASURED counter, not
+            // the constant PICKUP_GRACE_POLLS - 1 that used to stand in for it — the two happen to
+            // agree today, but only the counter cannot drift from the loop's real behaviour if
+            // PICKUP_GRACE_POLLS or the loop ever changes. Reference the constant here (rather than
+            // hardcoding "7") so this assertion itself does not silently stop discriminating if
+            // PICKUP_GRACE_POLLS changes later.
+            assertTrue(message.contains("(" + (LeadRollover.PICKUP_GRACE_POLLS - 1) + " of those were nudged)"),
+                    "must print the measured nudge count: " + message);
         } finally {
             detachLog(events);
         }
@@ -1000,9 +1008,53 @@ class LeadRolloverTest {
             ILoggingEvent event = lastEventContaining(events, "lead-rollover: rolled");
             assertEquals(Level.INFO, event.getLevel());
             String message = event.getFormattedMessage();
-            assertTrue(message.contains("elapsedMs=6500"), "must print the MEASURED elapsed time for "
+            // fleetd #494 follow-up: waitUntilAtTurnBoundary now also reads the injected clock one
+            // extra time (to compute ITS OWN measured elapsed on the success path), so the shared
+            // fixture clock advances by one more 500ms tick before the roll finishes than it did
+            // before that follow-up — 7000ms, not 6500ms.
+            assertTrue(message.contains("elapsedMs=7000"), "must print the MEASURED elapsed time for "
                     + "the whole roll — with this fixture's advancing clock, the full roll (turn-settle "
-                    + "wait + /clear wait + bootstrapText) took 6500ms: " + message);
+                    + "wait + /clear wait + bootstrapText) took 7000ms: " + message);
+        } finally {
+            detachLog(events);
+        }
+    }
+
+    @Test
+    @DisplayName("[fleetd #494 follow-up] the turn-settle timeout warn line prints the MEASURED "
+            + "elapsed time next to the configured budget, never the configured value alone")
+    void turnTimeoutLogPrintsMeasuredElapsedNotJustConfigured() throws IOException {
+        // The brief that named the four items this ticket fixed left this exact sibling line out —
+        // "did not reach a turn boundary (IDLE or DONE) within {}s after confirm()" — even though it
+        // has the identical defect shape one method below. Same fixture shape as
+        // clearTimeoutLogPrintsMeasuredElapsedAndNudgesNotJustConfigured, but for the FIRST wait: the
+        // calling lead's own pane never goes idle, so waitUntilAtTurnBoundary times out.
+        FakeHerdr herdr = new FakeHerdr();
+        herdr.agentStatus("working"); // the calling lead's own pane — never goes idle in this test
+        Path handover = writeHandover("handover contents");
+        FleetConfig.LeadRollover config =
+                new FleetConfig.LeadRollover(handover.toString(), true, 3600, 1 /*turnSettleSeconds*/, 20, "text");
+        AtomicLong clock = new AtomicLong(1_000);
+        LeadRollover rollover = newRollover(herdr, config, () -> clock.addAndGet(500));
+
+        ListAppender<ILoggingEvent> events = attachLog();
+        try {
+            LeadRollover.PendingRollover pending = rollover.open(LEAD, "context is full");
+            LeadRollover.RollDecision decision = rollover.confirm(LEAD, pending.token(), true);
+
+            assertTrue(decision.accepted(), "every synchronous gate should pass; the refusal happens "
+                    + "only inside the deferred continuation, which this test's synchronous runner "
+                    + "has already run to completion by the time confirm() returns");
+
+            ILoggingEvent event = lastEventContaining(events, "refusing to send /clear at all");
+            assertEquals(Level.WARN, event.getLevel());
+            String message = event.getFormattedMessage();
+            assertTrue(message.contains("configured=1s"), "must label the configured budget: " + message);
+            assertTrue(message.contains("elapsed=1500ms"), "must print the MEASURED elapsed time — "
+                    + "with this fixture's advancing clock, the wait actually ran 1500ms against a "
+                    + "1s(=1000ms) configured budget: " + message);
+            assertFalse(message.contains("within 1s"), "must not present the configured budget as if "
+                    + "it were the measured wait duration: " + message);
         } finally {
             detachLog(events);
         }