Tech debt cleanup: update README, fix comments, sync shared submodule

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

bp/auth/routes.py

@@ -90,8 +90,7 @@ def register(url_prefix="/auth"):
 
         if not g.get("user"):
             return redirect(host_url(url_for("auth.login_form")))
-        # TODO: Create _main_panel.html and _oob_elements.html for optimized HTMX
-        # For now, render full template for both HTMX and normal requests
+        # Full template for both HTMX and normal requests
         # Determine which template to use based on request type
         if not is_htmx_request():
             # Normal browser request: full page with layout