fix: report remaining subsessions on completion

docs/config.html

@@ -542,19 +542,17 @@
                 clearly reports that there is nothing to wait for.
               </p>
               <p>
-                A completion notice automatically wakes an idle parent. If the parent is busy, the notice queues until
-                the current turn ends rather than interrupting in-flight work. When multiple children finish at
-                different times, the parent handles each completion and calls <code>yield_to_subsessions</code> again
-                while another child is still working.
+                A completion notice wakes an idle parent or queues behind in-flight work. Each notice lists any other
+                tracked children still working, so the parent can continue work or call
+                <code>yield_to_subsessions</code> again at the next join point. Further notices arrive automatically; do
+                not poll.
               </p>
               <p>
                 <code>list_subsessions</code>, <code>check_subsession</code>, and <code>read_subsession</code> never yield
-                or change control flow and are not completion-polling mechanisms. They remain available for deliberate
-                inspection or recovery. While a child is working, agent-facing <code>check_subsession</code> and
-                <code>read_subsession</code> withhold partial output and transcript entries and instead direct the parent
-                to continue independent work or yield at the join point. Once the child is no longer working, its output
-                and transcript are available. Completion notifications, rather than polling inspection tools, are the
-                normal synchronization mechanism.
+                or change control flow. They are for deliberate inspection or recovery, not completion polling. While a
+                child works, agent-facing <code>check_subsession</code> and <code>read_subsession</code> withhold partial
+                output and direct the parent to continue independent work or yield at the join point. Output becomes
+                available when the child stops.
               </p>
               <p>
                 In <strong>Settings → Session daemon</strong>, these keys are saved on the selected machine. Restart the