Planner Bug: Assigns wrong value to some node inputs when making the workflow config

Describe the bug

Started a chat with planner. Below is the chat information along with a generated workflow config

{
  "message": "I'll create a workflow to:\n1. Search for recent studies on environmental justice that utilize AI methodologies.\n2. Analyze the findings to identify key themes and gaps in the research.\n\nWorkflow is ready and will be generated.",
  "ready_to_generate": true,
  "conversation_history": [
    {
      "role": "user",
      "content": "hi"
    },
    {
      "role": "assistant",
      "content": "Hello! How can I assist you with your research today?"
    },
    {
      "role": "user",
      "content": "i want to know what all research has been done in environmental justice with respect to using AI with it"
    },
    {
      "role": "assistant",
      "content": "I can create a workflow to search for research on environmental justice that incorporates AI methodologies. Would you like to focus on recent studies, or is there a specific time frame you have in mind?"
    },
    {
      "role": "user",
      "content": "i want to focus on recent studies"
    },
    {
      "role": "assistant",
      "content": "I'll create a workflow to:\n1. Search for recent studies on environmental justice that utilize AI methodologies.\n2. Analyze the findings to identify key themes and gaps in the research.\n\nWorkflow is ready and will be generated."
    },
    {
      "role": "user",
      "content": "ok do it"
    },
    {
      "role": "assistant",
      "content": "I'll create a workflow to:\n1. Search for recent studies on environmental justice that utilize AI methodologies.\n2. Analyze the findings to identify key themes and gaps in the research.\n\nWorkflow is ready and will be generated."
    },
    {
      "role": "system",
      "content": "Workflow is generated",
      "workflow_id": "d385be16-2f9e-4699-80cf-2291fbcb6012",
      "workflow_created_at": "2025-12-10 17:01:01.599697+00:00"
    }
  ],
  "workflow_config": {
    "workflow_type": "AKDResearchWorkflow",
    "version": "1.0.0",
    "nodes": [
      {
        "type": "deep_search",
        "input": {
          "fields": [
            {
              "query": "recent studies on environmental justice that utilize AI methodologies"
            },
            {
              "search_mode": "recent"
            },
            {
              "additional_context": "Research goal is to explore the intersection of environmental justice and AI in recent research."
            }
          ]
        },
        "output": {
          "fields": []
        },
        "io_map": null
      },
      {
        "type": "gap_analysis",
        "input": {
          "fields": [
            {
              "gap": "gaps in research on environmental justice and AI"
            }
          ]
        },
        "output": {
          "fields": []
        },
        "io_map": {
          "search_results": "$.deep_search.outputs.results"
        }
      }
    ],
    "output": {
      "fields": []
    },
    "edges": [
      {
        "from_node": "START",
        "to_node": "deep_search"
      },
      {
        "from_node": "deep_search",
        "to_node": "gap_analysis"
      },
      {
        "from_node": "gap_analysis",
        "to_node": "END"
      }
    ]
  },
  "chat_id": "d18c209d-312e-4d0c-8026-7c75b2e8d6b8",
  "last_workflow_id": "d385be16-2f9e-4699-80cf-2291fbcb6012",
  "user_id": "e980d3f6-f833-47a5-9951-0a2055af36c9"
}

the planner output a json that has search_mode: recent but it can only be fast,medium or long

Steps to reproduce the behavior

1. Goto http://akdbac-apise-ulverh4gaexc-980808868.us-east-1.elb.amazonaws.com/api/v1/docs#/chats/upsert_chat_api_v1_chats__post
2. Try to recreate the conversation looking at the conversation history above
3. Observe the workflow config given by planner

Expected Behavior

Should have assigned search_mode to allowed values

Relevant log output