Add x-fluxzy-network-error header on 528 responses#656
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Emit a stable errno-like token (connection_refused, dns_notfound, tls_cert_expired, ...) on every synthesized 528 and persist it on ClientError.NetworkErrorCode for archive readers. Also fixes the existing extra-header insertion that glued new headers onto the previous line.
Add docs/528-error-code.md with a token-by-token table covering the connection, DNS, TLS, and other layers, plus a sample 528 response and short snippets for reading the token from an HttpClient response and from an archived ClientError.
This was referenced May 12, 2026
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Summary
x-fluxzy-network-error: <token>response header on every synthesized 528, with 19 stable errno-like tokens (connection_refused,dns_notfound,tls_cert_expired, ...) defined onFluxzy.Core.NetworkErrorCodes.ClientError.NetworkErrorCodeso HAR / .fxzy archives carry it.docs/528-error-code.md.