ci: try 12 local Windows test jobs

.bazelrc

@@ -166,7 +166,7 @@ common:ci-windows-cross --config=remote
 common:ci-windows-cross --host_platform=//:rbe
 common:ci-windows-cross --strategy=remote
 common:ci-windows-cross --strategy=TestRunner=local
-common:ci-windows-cross --local_test_jobs=4
+common:ci-windows-cross --local_test_jobs=12
 common:ci-windows-cross --test_env=RUST_TEST_THREADS=1
 # Native Windows CI still covers the PowerShell tests. The cross-built gnullvm
 # binaries currently hang in PowerShell AST parser tests when those binaries are

codex-rs/core/tests/all.rs

@@ -3,3 +3,8 @@
 pub use codex_protocol::error;
 
 mod suite;
+
+#[test]
+fn windows_bazel_concurrency_experiment_cache_bust_marker() {
+    println!("windows Bazel concurrency experiment: jobs12_threads1");
+}