fix(examples): use lower-aware slot html updates

Move canonical examples and docs off direct RenderSlotExt render shortcuts so slot updates use generated render/lowering before HTML replacement, preserving runtime metadata for follow-up interactions.

req: component/003

req: runtime/001

req: dx/006

req: examples/003

examples/techdemo/src/lib.rs

@@ -7,7 +7,7 @@ mod tests {
     use super::ui::issue_card::handles as card_handles;
     use super::ui::issue_lane::events as lane_events;
     use hemplate::Hemplate;
-    use slhx::{Effect, IntoEffect, Payload, RenderSlotExt};
+    use slhx::{Effect, IntoEffect, Payload};
     use slhx_test::inspect;
 
     #[derive(Hemplate)]
@@ -30,7 +30,7 @@ mod tests {
     fn techdemo_uses_generated_slots_for_multi_target_updates() {
         fn update() -> impl IntoEffect {
             (
-                slots::hero_metrics.render(&FastMetric { label: "fast" }),
+                slots::hero_metrics.html(slhx::render(&FastMetric { label: "fast" })),
                 slots::notice.text("typed"),
             )
         }