test(examples): guard browser e2e product path

req: examples/005

req: convention/002

examples/techdemo/templates/control_center.heml

@@ -27,7 +27,7 @@
           </select>
         </label>
         <label>Impact <input name="impact" type="number" min="1" max="9" value="7"></label>
-        <button class="primary-action" type="button" form="launch-work" data-slhx-handle="launch_work" data-slhx-on="click">Create issue</button>
+        <button class="primary-action" type="button" form="launch-work" data-slhx-handle="launch_work">Create issue</button>
       </form>
       <div class="quick-actions">
         <button type="button" data-slhx-handle="simulate_push">Simulate server push</button>

slhx-js/runtime/slhx.js

@@ -23,10 +23,7 @@
   function formOwner(el) {
     if (!el || el.tagName === "FORM") return el;
     if (el.getAttribute && el.getAttribute("form")) return document.getElementById(el.getAttribute("form"));
-    const closest = el.closest ? el.closest("form") : null;
+    return el.closest ? el.closest("form") : null;
-    if (closest) return closest;
-    const root = rootOf(el);
-    return root && root.querySelector("form[data-slhx-form]");
   }
 
   function formHandleId(form) {

slhx-test/tests/examples_contract.rs

@@ -12,14 +12,28 @@ fn canonical_examples_do_not_author_browser_javascript() {
         }
         for (line_no, line) in text.lines().enumerate() {
             let trimmed = line.trim();
-            if trimmed.contains("<script") && !trimmed.contains(r#"<script src="/slhx.js" defer></script>"#) {
+            if trimmed.contains("<script")
-                failures.push(format!("{}:{}: inline <script> is not allowed", path.display(), line_no + 1));
+                && !trimmed.contains(r#"<script src="/slhx.js" defer></script>"#)
+            {
+                failures.push(format!(
+                    "{}:{}: inline <script> is not allowed",
+                    path.display(),
+                    line_no + 1
+                ));
             }
             if contains_inline_event_handler(trimmed) {
-                failures.push(format!("{}:{}: inline on*= handler is not allowed", path.display(), line_no + 1));
+                failures.push(format!(
+                    "{}:{}: inline on*= handler is not allowed",
+                    path.display(),
+                    line_no + 1
+                ));
             }
             if trimmed.to_ascii_lowercase().contains("javascript:") {
-                failures.push(format!("{}:{}: javascript: URL is not allowed", path.display(), line_no + 1));
+                failures.push(format!(
+                    "{}:{}: javascript: URL is not allowed",
+                    path.display(),
+                    line_no + 1
+                ));
             }
         }
     });
@@ -27,6 +41,23 @@ fn canonical_examples_do_not_author_browser_javascript() {
     assert!(failures.is_empty(), "{}", failures.join("\n"));
 }
 
+#[test]
+fn browser_e2e_does_not_shortcut_product_interactions() {
+    // req: examples/005
+    let root = Path::new(env!("CARGO_MANIFEST_DIR")).parent().unwrap();
+    let browser_e2e = root.join("examples/techdemo/tests/browser_e2e.rs");
+    let source = std::fs::read_to_string(browser_e2e).unwrap();
+
+    assert!(
+        !source.contains("fetch(\"/\""),
+        "browser E2E must drive UI, not post directly"
+    );
+    assert!(
+        !source.contains("applyBatch(buffer"),
+        "browser E2E must not apply wire batches manually"
+    );
+}
+
 fn scan_examples(dir: &Path, visit: &mut impl FnMut(&Path, &str)) {
     for entry in std::fs::read_dir(dir).unwrap() {
         let entry = entry.unwrap();
@@ -44,7 +75,10 @@ fn scan_examples(dir: &Path, visit: &mut impl FnMut(&Path, &str)) {
 }
 
 fn is_example_source(path: &PathBuf) -> bool {
-    matches!(path.extension().and_then(|ext| ext.to_str()), Some("rs" | "heml" | "html"))
+    matches!(
+        path.extension().and_then(|ext| ext.to_str()),
+        Some("rs" | "heml" | "html")
+    )
 }
 
 fn contains_inline_event_handler(line: &str) -> bool {
@@ -52,7 +86,11 @@ fn contains_inline_event_handler(line: &str) -> bool {
     let mut i = 0;
     while i + 3 < bytes.len() {
         let boundary = bytes[i].is_ascii_whitespace() || bytes[i] == b'<';
-        if boundary && bytes[i + 1] == b'o' && bytes[i + 2] == b'n' && bytes[i + 3].is_ascii_lowercase() {
+        if boundary
+            && bytes[i + 1] == b'o'
+            && bytes[i + 2] == b'n'
+            && bytes[i + 3].is_ascii_lowercase()
+        {
             let mut j = i + 4;
             while j < bytes.len() && bytes[j].is_ascii_lowercase() {
                 j += 1;