feat(automations): wire agent_task to multi_agent_chat with auto-approve loop

surfsense_backend/app/automations/actions/agent_task/finalize.py

@@ -0,0 +1,44 @@
+"""Extract the agent's final assistant text from the terminal invoke result."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from langchain_core.messages import AIMessage
+
+
+def extract_final_assistant_message(result: Any) -> str | None:
+    """Return the last ``AIMessage`` text content, or ``None`` if there isn't one.
+
+    Multi-part messages (content lists) are flattened by concatenating ``text``
+    parts in order. Non-string content (tool calls, images) is skipped.
+    """
+    if not isinstance(result, dict):
+        return None
+    messages = result.get("messages")
+    if not isinstance(messages, list):
+        return None
+
+    for msg in reversed(messages):
+        if not isinstance(msg, AIMessage):
+            continue
+        return _content_to_text(msg.content)
+    return None
+
+
+def _content_to_text(content: Any) -> str | None:
+    if isinstance(content, str):
+        text = content.strip()
+        return text or None
+    if isinstance(content, list):
+        parts: list[str] = []
+        for part in content:
+            if isinstance(part, str):
+                parts.append(part)
+            elif isinstance(part, dict) and part.get("type") == "text":
+                text = part.get("text")
+                if isinstance(text, str):
+                    parts.append(text)
+        joined = "".join(parts).strip()
+        return joined or None
+    return None