feat: add xAI/Grok cost tracking to unified budget system#10
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Wire trackCostDirect() into all xAI API call sites (grokChat, analyzeImage, fetchArticle, xSearch) so Grok usage is visible in budget enforcement, daily summaries, and `xint costs` CLI. - Add 6 xAI operation rates to COST_RATES - Add trackCostDirect() for token-based costs with known USD amounts - Track actual cost from MODEL_PRICING + token usage in grok.ts - Track xAI Responses API costs in article.ts and x_search.ts - Add tests for trackCostDirect and xAI cost rates Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
trackCostDirect()into all xAI API call sites so Grok usage is visible in budget enforcement, daily summaries, andxint costsCLICOST_RATES(grok_chat, grok_analyze, grok_vision, grok_sentiment, xai_article, xai_x_search)MODEL_PRICING+ token usage ingrok.ts,article.ts,x_search.tstrackCostDirectand xAI cost rates (21/21 pass)Test plan
bun test lib/costs.test.ts— 21/21 passxint costs todayshows both X API and Grok usage