fix(xai-oauth): echo code_challenge in token POST so PKCE exchange succeeds (#26990) - #26999

fix(xai-oauth): echo code_challenge in token POST so PKCE exchange succeeds (#26990)#26999

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xxxigm:fix/xai-oauth-pkce-verifier-26990xxxigm/hermes-agent:fix/xai-oauth-pkce-verifier-26990Copy head branch name to clipboard