Run quote lifecycle retention on a timer

Proof: History writer now runs quote lifecycle retention immediately and on a repo-owned timer independent of Kafka batch traffic, with regression coverage for the timer and shutdown cleanup.
Assumptions: A one-minute maintenance cadence remains the approved bounded retention cadence for this turn.
Still fake: Retention remains aggregate rollup evidence for pruned non-success detail; already-pruned historical detail cannot be reconstructed.

src/apps/history-writer.mjs

@@ -229,6 +229,12 @@ await refreshQuoteLifecycleRetentionState().catch((error) => {
   state.retention_error = serializeError(error);
 });
 
+const quoteLifecycleRetentionMaintenanceTimer = setInterval(() => {
+  void maybeRunQuoteLifecycleRetentionMaintenance();
+}, quoteLifecycleRetentionMaintenanceIntervalMs);
+quoteLifecycleRetentionMaintenanceTimer.unref?.();
+await maybeRunQuoteLifecycleRetentionMaintenance({ force: true });
+
 for (const historyConsumer of durableConsumers) {
   await runHistoryConsumer(historyConsumer);
 }
@@ -770,6 +776,7 @@ function resumeConsumers() {
 }
 
 async function shutdown() {
+  clearInterval(quoteLifecycleRetentionMaintenanceTimer);
   await controlApi.close().catch(() => {});
   await Promise.allSettled([
     ...durableConsumers.map((historyConsumer) => historyConsumer.disconnect()),

test/history-writer-static.test.mjs

@@ -24,6 +24,9 @@ test('history writer replays durable topics but joins the raw quote firehose liv
   assert.match(source, /runQuoteLifecycleRetentionMaintenance/);
   assert.match(source, /loadQuoteLifecycleRetentionSummary/);
   assert.match(source, /maybeRunQuoteLifecycleRetentionMaintenance/);
+  assert.match(source, /quoteLifecycleRetentionMaintenanceTimer\s*=\s*setInterval/);
+  assert.match(source, /maybeRunQuoteLifecycleRetentionMaintenance\(\{\s*force:\s*true\s*\}\)/);
+  assert.match(source, /clearInterval\(quoteLifecycleRetentionMaintenanceTimer\)/);
   assert.match(source, /retention_mode/);
   assert.match(source, /storage_pressure/);
   assert.doesNotMatch(source, /RetainRecentMs/);