Stabilize Bazel tests (timeout tweaks and flake fixes) (#17791)

codex-rs/exec-server/BUILD.bazel

@@ -3,5 +3,9 @@ load("//:defs.bzl", "codex_rust_crate")
 codex_rust_crate(
     name = "exec-server",
     crate_name = "codex_exec_server",
+    # Keep the crate's integration tests single-threaded under Bazel because
+    # they install process-global test-binary dispatch state, and the remote
+    # exec-server cases already rely on serialization around the full CLI path.
+    integration_test_args = ["--test-threads=1"],
     test_tags = ["no-sandbox"],
 )