style(tests,build): use module-level pytest import; gitignore embedded .so

- tests/integration/test_sdk.py: drop redundant `import pytest as _pytest`,
  use the top-level pytest import.
- coordinode-embedded/.gitignore: add `*.so` so locally built Rust
  extension modules don't get committed with platform suffix.

Author: polaz

coordinode-embedded/.gitignore

@@ -1,2 +1,3 @@
 target/
 Cargo.lock
+*.so

tests/integration/test_sdk.py

@@ -720,13 +720,11 @@ def test_cypher_accepts_consistency_kwargs(client):
 
 def test_cypher_rejects_invalid_consistency_values(client):
     """Invalid consistency kwargs raise ValueError before the RPC."""
-    import pytest as _pytest
-
-    with _pytest.raises(ValueError, match="invalid read_concern"):
+    with pytest.raises(ValueError, match="invalid read_concern"):
         client.cypher("RETURN 1", read_concern="strong")
-    with _pytest.raises(ValueError, match="invalid write_concern"):
+    with pytest.raises(ValueError, match="invalid write_concern"):
         client.cypher("RETURN 1", write_concern="w9")
-    with _pytest.raises(ValueError, match="invalid read_preference"):
+    with pytest.raises(ValueError, match="invalid read_preference"):
         client.cypher("RETURN 1", read_preference="leader")
-    with _pytest.raises(ValueError, match="after_index must be a non-negative integer"):
+    with pytest.raises(ValueError, match="after_index must be a non-negative integer"):
         client.cypher("RETURN 1", after_index=-1)