[codex] Add Codex auth email as Langfuse user id#8
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Summary
This adds an automatic
user_idfallback for Langfuse traces emitted by the Codex tracing plugin. WhenLANGFUSE_CODEX_USER_IDor configuser_idis not set, the plugin reads Codex auth fromCODEX_HOME/auth.jsonor~/.codex/auth.json, decodes thetokens.id_tokenJWT payload, and uses theemailclaim as the Langfuse trace user id when present.Explicit user id configuration still takes precedence, and missing or malformed auth data is ignored silently so tracing continues to fail open.
Impact
Codex traces in Langfuse can now be grouped by the signed-in Codex user's email address without requiring extra configuration.
Validation
pnpm vitest runpnpm run buildpnpm run format:checkpnpm run lint:tsc