Add chat streaming error classification, helpers, and StreamResult.

surfsense_backend/app/tasks/chat/streaming/stream_result.py

@@ -0,0 +1,28 @@
+"""Mutable facts collected while streaming one agent turn."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+
+@dataclass
+class StreamResult:
+    accumulated_text: str = ""
+    is_interrupted: bool = False
+    interrupt_value: dict[str, Any] | None = None
+    sandbox_files: list[str] = field(default_factory=list)
+    agent_called_update_memory: bool = False
+    request_id: str | None = None
+    turn_id: str = ""
+    filesystem_mode: str = "cloud"
+    client_platform: str = "web"
+    intent_detected: str = "chat_only"
+    intent_confidence: float = 0.0
+    write_attempted: bool = False
+    write_succeeded: bool = False
+    verification_succeeded: bool = False
+    commit_gate_passed: bool = True
+    commit_gate_reason: str = ""
+    assistant_message_id: int | None = None
+    content_builder: Any | None = field(default=None, repr=False)