fix(openai-responses): disable strict mode for open tool schemas

[alesya-h]

I have an mcp server that needs to receive arbitrary json as a parameter. current implementation makes any request using GPT 5.4 fail when this mcp is present. this allows to disable strict mode if the schema is explicitly non-strict

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[amitksingh1490]

@alesya-h This is great. Please share the mcp which I can use to reproduce this issue. setting is strict false in openai models increase the tool call errors.

[alesya-h]

@amitksingh1490 https://github.com/alesya-h/jsmcp

[alesya-h]

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● [09:22:34] Initialize 48ee2280-1b40-4fad-929f-e0a68576a282
 jsmcp                                                        󱙺 FORGE  gpt-5.4
󰄾 hi
● [09:22:36] ERROR: POST https://chatgpt.com/backend-api/codex/responses

Caused by:
    0: 400 POST https://chatgpt.com/backend-api/codex/responses
    1: {
         "error": {
           "message": "Invalid schema for function 'mcp_jsmcp_tool_execute_code': In context=('properties', 'data'), 'additionalProperties' is required to be supplied and to be false.",
           "type": "invalid_request_error",
           "param": "tools[14].parameters",
           "code": "invalid_function_parameters"
         }
       }
 jsmcp