feat: add cost tracking to chat and completion responses#68
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Add OpenRouter usage accounting support so callers can read the actual
cost of a request. New WithUsage / WithCompletionUsage options send
usage:{include:true}, and the shared Usage struct gains optional Cost,
CostDetails, PromptTokensDetails, and CompletionTokensDetails fields
(populated for both non-streaming and the final streaming chunk).
Includes unit tests (request shape + response decoding), a live e2e
test (chatcost), examples, and docs. Regenerated docs/api-surface.json.
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Add OpenRouter usage accounting support so callers can read the actual
cost of a request. New WithUsage / WithCompletionUsage options send
usage:{include:true}, and the shared Usage struct gains optional Cost,
CostDetails, PromptTokensDetails, and CompletionTokensDetails fields
(populated for both non-streaming and the final streaming chunk).
Includes unit tests (request shape + response decoding), a live e2e
test (chatcost), examples, and docs. Regenerated docs/api-surface.json.