The previous fix (8151331) set res.err but pino-http wasn't picking it
up (likely Express 5 response object behavior). Switch to a custom
__errorContext property on the response that customErrorMessage and
customProps read directly, bypassing pino-http's unreliable res.err
check. Remove duplicate manual logger.error calls from the error
handler since pino-http now gets the full context.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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