fix: normalize cached and reasoning usage details#28
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Summary
cache_read_input_tokensandoutput_reasoning_tokensusing LangFuse-compatible price keysWhy
Codex reports cached input and reasoning output as subsets of input/output. LangFuse treats usage details as additive buckets, so sending inclusive values double-counts cacheable input and makes custom model cost inference incorrect.
Closes #22.
Validation
corepack pnpm@9.5.0 test(35 passing)corepack pnpm@9.5.0 lintReal trace reproduction is documented in #22.