feat: JSON-lines protocol with command and event dataclasses

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/conftest.py

@@ -0,0 +1,13 @@
+import pytest
+
+@pytest.fixture
+def tmp_workbench(tmp_path):
+    """Provide a temporary ~/Kitty-Workbench directory."""
+    wb = tmp_path / "Kitty-Workbench"
+    wb.mkdir()
+    return wb
+
+@pytest.fixture
+def socket_path(tmp_path):
+    """Provide a temporary socket path."""
+    return str(tmp_path / "test.sock")