fix/fetch documentation input param

[umuthopeyildirim]

If inputParams is undefined, parameters is returning non valid object;

{
    "name": "fetch_langgraph_documentation",
    "description": "Fetch entire documentation file from GitHub repository: langchain-ai/langgraph. Useful for general questions. Always call this tool first if asked about langchain-ai/langgraph.",
    "parameters": {
        "type": "object"
    }
}

If inputParams is {}, parameters is returning correct empty object;

{
    "name": "fetch_langgraph_documentation",
    "description": "Fetch entire documentation file from GitHub repository: langchain-ai/langgraph. Useful for general questions. Always call this tool first if asked about langchain-ai/langgraph.",
    "parameters": {
        "type": "object",
        "properties": {},
        "additionalProperties": false,
        "$schema": "http://json-schema.org/draft-07/schema#"
    }
}

[idosal]

Thanks a lot for the contribution! You're absolutely right. When the code was committed, it was necessary for Windsurf, but we've just added support for HTTP Streaming and explicit Zod typing that works for all IDEs: #154. It should cover this case. Please LMK if it doesn't.