fix(streaming): add null usage fallback to all providers #901
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StreamEndEvent.usage can be null when providers don't include usage data in their final stream chunk, causing a TypeError downstream. Add `?? new Usage(0, 0)` fallback to emitStreamEndEvent() in all providers missing it, matching the existing pattern in the OpenAI stream handler.
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Summary
StreamEndEvent.usagecan benullwhen providers don't include usage data in their final stream chunk, causing aTypeErrordownstream (e.g. inlaravel/ai)?? new Usage(0, 0)fallback toemitStreamEndEvent()in all 7 providers missing it: Groq, XAI, OpenRouter, Mistral, DeepSeek, Anthropic, and GeminiRefs #900
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