feat: updated dhcp client arch

[tremwil]

• Adds updated DHCP client architecture type values from the IANA
• Implements encoding/decoding for ClientArchType DHCPv6 options

Since both of the above are breaking changes, while doing the former I refactored the Architecture enum as a newtype variant with associated consts. IMO this provides better ergonomics than a regular enum with an Unknown variant and manual conversions, though I don't mind reverting to an enum if this isn't welcome.

Closes #98.

[leshow]

Yeah, I went back and forth on the enum, but I think in the end you're right about the ergonomics. Since the enum is not closed and has the unknown variant, each new addition is a breaking change to the API. It was nice to have the exhaustive matching in some cases but I believe the http library uses const as well so I think it's the right call.

There are many of these enums in the repo though, so I probably won't cut a new release until they are all consistent in their representation.

[leshow]

Thanks for the contribution!

[stappersg]

On Sat, May 09, 2026 at 01:09:30PM -0700, Evan Cameron wrote: Thanks for the contribution!

+1