feat(wasm): validate client event and state ABI

req: client_local/005\nreq: client_local/006\nreq: client_local/007\nreq: client_local/008\nreq: client_local/009\nreq: client_local/010\nreq: client_local/014

hemx-build/src/lib.rs

@@ -1609,6 +1609,8 @@ fn known_hemx_attr(name: &str) -> bool {
             | "data-hemx-on"
             | "data-hemx-client"
             | "data-hemx-client-event"
+            | "data-hemx-client-fallback"
+            | "data-hemx-client-state-version"
             | "data-hemx-pending-class"
             | "data-hemx-indicator"
             | "data-hemx-confirm"
@@ -1668,6 +1670,20 @@ fn reject_invalid_hemx_attr_values(path: &Path, attrs: &[SurfaceAttribute]) -> i
                     "expected a runtime-supported event",
                 ));
             }
+            "data-hemx-client-state-version"
+                if value
+                    .parse::<u32>()
+                    .ok()
+                    .filter(|version| *version > 0)
+                    .is_none() =>
+            {
+                return Err(invalid_hemx_value(
+                    path,
+                    &attr.name,
+                    value,
+                    "expected a positive client state ABI version",
+                ));
+            }
             "data-hemx-on" if !valid_event_list(value) => {
                 return Err(invalid_hemx_value(
                     path,