Add bytecode repeat test to WASM build pipeline

Runs test_bytecode_repeat.js as step 6 of build-all.sh.
Currently warns on failure (known bug). Will become a hard
gate once the bytecode when/do/perform fix lands.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hosts/ocaml/browser/build-all.sh

@@ -35,4 +35,7 @@ cp -r dist/sx_browser.bc.wasm.assets ./ 2>/dev/null || true
 echo "=== 5. Run WASM tests ==="
 node test_wasm_native.js
 
+echo "=== 6. Run bytecode regression tests ==="
+node test_bytecode_repeat.js || echo "WARNING: bytecode repeat test failed (known bug)"
+
 echo "=== Done ==="