sdks/python: mirror Elydora-Python-SDK 2.0.2

Rebuilt from the standalone 54e65eb tree (durable transactions, Kiro IDE
adapter, hook retry with a bounded chain lock, version 2.0.2) with the
Open-Source API trims re-applied: no token rotation, token issuance, or
agent integration updates, and the mirror's registration contract and
OpenCode plugin tests kept.

Claude-Session: https://claude.ai/code/session_01QoUjdc7HGKTsgj5GhG8HvF

sdks/python/tests/test_gemini_transaction.py

@@ -63,17 +63,21 @@ def test_transaction_rolls_back_all_five_files(
     fixture = prepare_fixture(
         monkeypatch, tmp_path, existing_settings=original
     )
-    real_replace = _transaction.os.replace
+    real_replace = _transaction._replace_physical
     failed = False
 
-    def fail_settings_once(source: str, destination: str) -> None:
+    def fail_settings_once(
+        source: str,
+        destination: str,
+        directory: _transaction.PinnedDirectory,
+    ) -> None:
         nonlocal failed
         if os.path.abspath(destination) == str(fixture.config_path) and not failed:
             failed = True
             raise OSError("injected Gemini settings failure")
-        real_replace(source, destination)
+        real_replace(source, destination, directory)
 
-    monkeypatch.setattr(_transaction.os, "replace", fail_settings_once)
+    monkeypatch.setattr(_transaction, "_replace_physical", fail_settings_once)
 
     with pytest.raises(OSError, match="injected Gemini settings failure"):
         fixture.install()