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* fix: set langgraph and codex proxy runtime defaults * fix: address runtime default review feedback * fix: drop langgraph dev env defaults per maintainer review langgraph dev patches DATABASE_URI/REDIS_URI itself via patch_environment, so the reported KeyError cannot come from this flow; the env defaults added here were unnecessary. Scope the PR back to the codex proxy reasoning context fix only. --------- Co-authored-by: Xi Zhang <106144707+X-iZhang@users.noreply.github.com>