Update shared submodule + emit post events for federation

- Emit post.published/post.updated events from Ghost webhook sync
- Updated shared with federation handlers, delivery, anchoring

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bp/blog/ghost/ghost_sync.py

@@ -998,8 +998,25 @@ async def sync_single_post(sess: AsyncSession, ghost_id: str) -> None:
         tag_obj = await _upsert_tag(sess, pt)
         tag_map[pt["id"]] = tag_obj
 
-    await _upsert_post(sess, gp, author_map, tag_map)
-    # auto-commit
+    post = await _upsert_post(sess, gp, author_map, tag_map)
+
+    # Emit federation event for published posts (not pages, not drafts)
+    if post.status == "published" and not post.is_page and post.user_id:
+        from shared.events import emit_event
+        from shared.infrastructure.urls import app_url
+        event_type = "post.published" if post.created_at == post.updated_at else "post.updated"
+        await emit_event(
+            sess,
+            event_type=event_type,
+            aggregate_type="Post",
+            aggregate_id=post.id,
+            payload={
+                "user_id": post.user_id,
+                "title": post.title or "",
+                "excerpt": post.custom_excerpt or post.excerpt or "",
+                "url": app_url("coop", f"/{post.slug}/"),
+            },
+        )
 
 
 async def sync_single_page(sess: AsyncSession, ghost_id: str) -> None: