test(examples): forbid legacy lowering helpers

Extend the example contract to keep canonical runtime code on generated render/static_fragment APIs instead of lower_html/render_html aliases or inline include_str lowering.

req: dx/006

req: ceremony/002

req: component/003

slhx-test/tests/examples_contract.rs

@@ -60,6 +60,9 @@ fn canonical_examples_do_not_author_low_level_resource_plumbing() {
         "data-slot-id",
         "data-form-id",
         "data-atom-id",
+        "::lower(include_str!",
+        "lower_html(",
+        "render_html(",
     ];
     let mut failures = Vec::new();
     scan_examples(&examples, &mut |path, text| {