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Extract per-model token usage from resultLine.modelUsage (including cache tokens and exact API cost), flow CostEntry[] through EvalCollector, aggregate in finalize(). Extend CostEntry with cache_read_input_tokens, cache_creation_input_tokens, cost_usd. computeCosts() prefers exact cost_usd over MODEL_PRICING when available (~4x more accurate with prompt caching). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>