Add multi_agent_chat calendar slice with connector tools, agent, and domain prompt.

surfsense_backend/app/agents/multi_agent_chat/calendar/__init__.py

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+"""Google Calendar vertical slice: connector tools, domain agent, ``domain_prompt.md``."""
+
+from app.agents.multi_agent_chat.calendar.agent import build_calendar_domain_agent
+from app.agents.multi_agent_chat.calendar.connector_tools import (
+    build_google_calendar_connector_tools,
+)
+
+__all__ = [
+    "build_calendar_domain_agent",
+    "build_google_calendar_connector_tools",
+]

surfsense_backend/app/agents/multi_agent_chat/calendar/agent.py

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+"""Google Calendar domain agent graph."""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+
+import app.agents.multi_agent_chat.calendar as calendar_pkg
+from langchain_core.language_models import BaseChatModel
+from langchain_core.tools import BaseTool
+
+from app.agents.multi_agent_chat.shared.domain_agent_factory import build_domain_agent
+
+
+def build_calendar_domain_agent(llm: BaseChatModel, tools: Sequence[BaseTool]):
+    """Compiled Calendar domain-agent graph (prompt + tools co-located under ``calendar``)."""
+    return build_domain_agent(
+        llm,
+        tools,
+        prompt_package=calendar_pkg.__name__,
+        prompt_stem="domain_prompt",
+    )

surfsense_backend/app/agents/multi_agent_chat/calendar/connector_tools.py

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+"""Google Calendar connector LangChain tools (``new_chat`` factories)."""
+
+from __future__ import annotations
+
+from langchain_core.tools import BaseTool
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.agents.multi_agent_chat.shared.deps import connector_binding
+from app.agents.new_chat.tools.google_calendar import (
+    create_create_calendar_event_tool,
+    create_delete_calendar_event_tool,
+    create_search_calendar_events_tool,
+    create_update_calendar_event_tool,
+)
+
+
+def build_google_calendar_connector_tools(
+    *,
+    db_session: AsyncSession,
+    search_space_id: int,
+    user_id: str,
+) -> list[BaseTool]:
+    d = connector_binding(
+        db_session=db_session,
+        search_space_id=search_space_id,
+        user_id=user_id,
+    )
+    return [
+        create_search_calendar_events_tool(**d),
+        create_create_calendar_event_tool(**d),
+        create_update_calendar_event_tool(**d),
+        create_delete_calendar_event_tool(**d),
+    ]

surfsense_backend/app/agents/multi_agent_chat/calendar/domain_prompt.md

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+You are the Google Calendar domain agent. Use only the tools provided to complete calendar-related tasks. Stay focused on scheduling and calendar operations and respond concisely.