refactor(automations): move agent_task to builtin and restructure dispatch

surfsense_backend/app/automations/actions/__init__.py

@@ -21,4 +21,4 @@ __all__ = [
 ]
 
 # Built-in actions self-register at import time.
-from . import agent_task  # noqa: F401
+from . import builtin  # noqa: F401

surfsense_backend/app/automations/actions/builtin/__init__.py

@@ -0,0 +1,5 @@
+"""Built-in action types — each in its own subpackage, self-registering at import."""
+
+from __future__ import annotations
+
+from . import agent_task  # noqa: F401

surfsense_backend/app/automations/actions/builtin/agent_task/definition.py

@@ -2,8 +2,8 @@
 
 from __future__ import annotations
 
-from ..store import register_action
-from ..types import ActionDefinition
+from ...store import register_action
+from ...types import ActionDefinition
 from .factory import build_handler
 from .params import AgentTaskActionParams
 

surfsense_backend/app/automations/actions/builtin/agent_task/factory.py

@@ -4,7 +4,7 @@ from __future__ import annotations
 
 from typing import Any
 
-from ..types import ActionContext, ActionHandler
+from ...types import ActionContext, ActionHandler
 from .invoke import run_agent_task
 from .params import AgentTaskActionParams
 

surfsense_backend/app/automations/actions/builtin/agent_task/invoke.py

@@ -16,7 +16,7 @@ from app.agents.new_chat.mention_resolver import resolve_mentions, substitute_in
 from app.db import ChatVisibility, async_session_maker
 from app.schemas.new_chat import MentionedDocumentInfo
 
-from ..types import ActionContext
+from ...types import ActionContext
 from .auto_decide import build_auto_decisions
 from .dependencies import build_dependencies
 from .finalize import extract_final_assistant_message