chore(oss): audit the server package and resync the SDK mirrors

Split the 657-line operation service into eor, submit, and verify
modules, add the AGENT_REVOKED and KEY_RETIRED codes the Backend already
emits, and condense every multi-line comment. Mirror Node, Python, and
Go at 2.1.0 with the deep-health 503, non-idempotent retry, rotation
grace, and path-encoding fixes. Document which routes and response
fields the self-hosted server does not provide.

Claude-Session: https://claude.ai/code/session_01Agoc9bRVE9KL7mmWtey9Vq

sdks/python/elydora/plugins/droid_config.py

@@ -8,13 +8,13 @@ from typing import Dict, List, Optional, Tuple
 
 from ._jsonc import JsonPathPart, JsoncEditor
 from ._managed_files import FileSnapshot
+from ._runtime import same_path
 from .droid_contract import (
     TOOL_EVENTS,
     DroidHookMap,
     JsonObject,
     managed_removals,
     read_hook_map,
-    same_path,
 )
 from .droid_policy import DroidPolicyState