feat(jobs): repo-level embed triggers (pages/refs/source_docs)

create/update on embeddable repos enqueue embed.text with a singleton
key that coalesces rapid edits. No-op when the queue is not running
(server tests construct createApp without booting pg-boss).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

lib/jobs/triggers.js

@@ -0,0 +1,18 @@
+import * as queue from './queue.js';
+import { log } from '../log.js';
+
+// Fire-and-forget enqueue of an embed.text job after a repo write.
+// Never blocks the write: if the queue is not running (server tests),
+// or pg-boss errors transiently, we log + move on. Pending rows get
+// picked up by a future re-embed cron in Plan 4+.
+export async function triggerEmbed(entity_type, entity_id) {
+  if (!queue.instance()) return;   // not started — no-op
+  try {
+    await queue.enqueue('embed.text',
+      { entity_type, entity_id },
+      { singletonKey: `${entity_type}:${entity_id}` }
+    );
+  } catch (e) {
+    log.warn({ err: e, entity_type, entity_id }, 'triggerEmbed failed');
+  }
+}