feat: add safe BLE discovery and network baseline tools

tests/test_artifacts.py

@@ -0,0 +1,11 @@
+import json
+from pathlib import Path
+
+from k1link.artifacts import write_json_atomic
+
+
+def test_write_json_atomic(tmp_path: Path) -> None:
+    output = tmp_path / "nested" / "artifact.json"
+    write_json_atomic(output, {"value": "тест"})
+    assert json.loads(output.read_text(encoding="utf-8")) == {"value": "тест"}
+    assert not list(output.parent.glob("*.tmp"))