fix: improve cross-device evidence, request diagnostics and prompt efficiency

apps/admin_console/routers/sessions.py

@@ -17,6 +17,7 @@ import json
 import time
 from uuid import UUID
 from fastapi import APIRouter, HTTPException
+from fastapi.responses import Response
 
 from artemis.config import DB_PATH, TRACES_PATH
 from artemis.runtime import trace_store
@@ -35,6 +36,20 @@ from apps.admin_console.services.exploration_listing import exploration_metadata
 router = APIRouter(tags=["sessions"])
 
 
+@router.get("/api/sessions/{session_id}/request-diagnostics")
+def get_request_diagnostics(session_id: str, download: bool = False):
+    from apps.admin_console.services.request_diagnostics import request_diagnostics
+
+    result = request_diagnostics(session_id, limit=None if download else 100)
+    if not download:
+        return result
+    return Response(
+        json.dumps(result, ensure_ascii=False, indent=2),
+        media_type="application/json",
+        headers={"Content-Disposition": 'attachment; filename="model-request-diagnostics.json"'},
+    )
+
+
 @router.get("/api/sessions")
 async def list_sessions():
     # The body does blocking work (sqlite queries, filesystem scans, ffmpeg