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_droid_plugin.py

@@ -225,10 +225,16 @@ def test_guard_blocks_and_audit_preserves_native_payload(
         guard = managed_handler(hooks, "PreToolUse", "guard.py")
         audit = managed_handler(hooks, "PostToolUse", "hook.py")
         assert guard is not None and audit is not None
-        write_json(fixture.agent_dir / "status-cache.json", {
-            "status": "frozen",
-            "cached_at": time.time(),
-        })
+        status_cache_path = fixture.agent_dir / "status-cache.json"
+        write_json(
+            status_cache_path,
+            {
+                "status": "frozen",
+                "cached_at": time.time(),
+            },
+        )
+        if os.name != "nt":
+            status_cache_path.chmod(0o600)
         pre_payload = {
             "session_id": "session-1",
             "transcript_path": str(fixture.home_dir / "transcript.jsonl"),