jhillyerd / enmime / 27069187272

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fix: decouple internal/textproto from net/textproto error types (#397)

The vendored internal/textproto package was importing net/textproto
and using its ProtocolError and Error types. This undermined the
purpose of vendoring, as Go 1.26's CVE-2026-42507 fix changed
Error.Error() to quote the Msg field, breaking test expectations.

Define local ProtocolError and Error types with stable formatting
to insulate against upstream breaking changes while remaining
compatible with all Go versions.

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