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673ce8c091
`ChatXAI` currently forwards `stop` to xAI reasoning models, which xAI rejects. This causes calls such as `ChatXAI(model="grok-3", stop=[...])` and unprofiled reasoning aliases such as `ChatXAI(model="grok-4-fast-reasoning", stop=[...])` to fail before the model can respond. This updates the xAI payload construction so unsupported `stop` values are removed for reasoning models. The check uses generated model profiles when available and keeps an explicit alias fallback for known reasoning model names that may not be present in profile data, including older Grok 3 aliases and Grok 4 reasoning aliases. Explicit non-reasoning aliases continue to preserve `stop`. The regression tests cover the reported Grok 3 path, a current profiled reasoning model, the `grok-4-fast-reasoning` alias used by integration tests, and a non-reasoning model that should continue to preserve `stop`. AI-assisted contribution: this PR includes changes authored with AI-agent assistance.
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