feat(tools): add persistent bash and str-replace editor

python/sdk/tests/test_release_version.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import json
 import runpy
+import stat
 from pathlib import Path
 from types import SimpleNamespace
 
@@ -37,3 +38,40 @@ def test_repository_version_rejects_non_stable_versions(tmp_path: Path) -> None:
 
     with pytest.raises(ValueError, match="must be stable X.Y.Z"):
         build_python_release.repository_version(tmp_path)
+
+
+def test_stage_runtime_copies_executable_and_spawn_helper(tmp_path: Path) -> None:
+    executable = tmp_path / "dsh-jsonrpc-agent-pkg-macos-arm64"
+    executable.write_bytes(b"runtime")
+    executable.chmod(0o755)
+    spawn_helper = Path(f"{executable}-spawn-helper")
+    spawn_helper.write_bytes(b"helper")
+    spawn_helper.chmod(0o751)
+    destination = tmp_path / "staging"
+
+    build_python_release.stage_runtime(
+        destination,
+        "1.2.3",
+        executable,
+        executable.name,
+    )
+
+    runtime_dir = destination / "src" / "deepseek_harness_runtime" / "runtime"
+    assert (runtime_dir / executable.name).read_bytes() == b"runtime"
+    copied_helper = runtime_dir / spawn_helper.name
+    assert copied_helper.read_bytes() == b"helper"
+    assert copied_helper.stat().st_mode & stat.S_IXUSR
+
+
+def test_stage_runtime_rejects_missing_spawn_helper(tmp_path: Path) -> None:
+    executable = tmp_path / "dsh-jsonrpc-agent-pkg-linux-x64"
+    executable.write_bytes(b"runtime")
+    executable.chmod(0o755)
+
+    with pytest.raises(FileNotFoundError, match="spawn helper"):
+        build_python_release.stage_runtime(
+            tmp_path / "staging",
+            "1.2.3",
+            executable,
+            executable.name,
+        )