fleetd #480 Unit E correction: retire "injectable" wording from the log lines

Both waitUntilAtTurnBoundary guard messages still said "never went idle" /
"did not become injectable" — the old mental model the rename was meant to
retire. Made both say what the code now actually waits for: a turn boundary
(IDLE or DONE).

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

@@ -283,9 +283,10 @@ public final class LeadRollover {
         String lead = p.leadTerminal();
         boolean turnSettled = waitUntilAtTurnBoundary(lead, cfg.turnSettleSeconds());
         if (!turnSettled) {
-            log.warn("lead-rollover: pane {} never went idle 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={})",
+            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());
             return;
         }
@@ -296,8 +297,8 @@ public final class LeadRollover {
         agents.send(lead, "/clear");
         boolean clearSettled = waitUntilAtTurnBoundary(lead, cfg.clearSettleSeconds());
         if (!clearSettled) {
-            log.warn("lead-rollover: pane {} did not become injectable within {}s after /clear — "
-                            + "NOT sending bootstrapText (token={})",
+            log.warn("lead-rollover: pane {} did not reach a turn boundary (IDLE or DONE) within {}s "
+                            + "after /clear — NOT sending bootstrapText (token={})",
                     lead, cfg.clearSettleSeconds(), p.token());
             return;
         }