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PR #114 pointed @lead/@ops at xai/grok-4.5 but never gave opencode a provider config for it — xai is not a built-in like anthropic was, it needs the same explicit OpenAI-compatible block as ollama/ollama-cloud (confirmed by the prior, never-merged investigation in PR #110). Without this, any @lead/@ops run fails immediately on an unresolvable provider. Adds the xai provider block (baseURL https://api.x.ai/v1, models derived from agents.json) and passes XAI_API_KEY into the Install-opencode step (it was already added to the Run-agent step in #114).