fix(examples): keep test updates lower-aware

Move canonical example test helpers and docs off direct slot render shortcuts so even test-only slot updates use generated lower-aware HTML paths.

req: component/003

req: runtime/001

req: examples/003

examples/techdemo/src/lib.rs

@@ -30,7 +30,7 @@ mod tests {
     fn techdemo_uses_generated_slots_for_multi_target_updates() {
         fn update() -> impl IntoEffect {
             (
-                slots::hero_metrics.html(slhx::render(&FastMetric { label: "fast" })),
+                slots::hero_metrics.html(super::ui::render(&FastMetric { label: "fast" })),
                 slots::notice.text("typed"),
             )
         }