feat(chat): add multi-agent mode routing scaffold and telemetry.

surfsense_backend/app/agents/new_chat/telemetry.py

@@ -0,0 +1,43 @@
+"""Architecture telemetry logging for chat execution modes."""
+
+from __future__ import annotations
+
+import json
+from typing import Any
+
+from app.utils.perf import get_perf_logger
+
+_perf_log = get_perf_logger()
+
+
+def log_architecture_telemetry(
+    *,
+    phase: str,
+    architecture_mode: str,
+    orchestrator_used: bool,
+    worker_count: int,
+    retry_count: int,
+    latency_ms: float,
+    token_total: int,
+    request_id: str | None = None,
+    turn_id: str | None = None,
+    status: str = "ok",
+    source: str = "new_chat",
+    extra: dict[str, Any] | None = None,
+) -> None:
+    payload: dict[str, Any] = {
+        "phase": phase,
+        "source": source,
+        "status": status,
+        "architecture_mode": architecture_mode,
+        "orchestrator_used": orchestrator_used,
+        "worker_count": worker_count,
+        "retry_count": retry_count,
+        "latency_ms": round(latency_ms, 2),
+        "token_total": token_total,
+        "request_id": request_id or "unknown",
+        "turn_id": turn_id or "unknown",
+    }
+    if extra:
+        payload.update(extra)
+    _perf_log.info("[architecture_telemetry] %s", json.dumps(payload, ensure_ascii=False))