[WIP] Fix CI job error for unrecognized Content-Type header

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

@l r @copilot

The CI job failed because of this error in build.zig.zon:

error: unrecognized 'Content-Type' header: 'text/html; charset=utf-8'
  .url = "https://github.com/judofyr/spice",

The error means Zig tried to fetch https://github.com/judofyr/spice as a dependency URL, but it received an HTML page (likely a 404 or redirect) instead of a Zig package or archive. That URL points to a repository, not a downloadable release or .tar.gz archive, which Zig currently does not support for dependencies. It expects a direct archive file link.

Solution:

• Change the .spice.url in your build.zig.zon to a downloadable archive.
  For example, use the archive URL from a tagged release:

.spice = .{
    .url = "https://github.com/judofyr/spice/archive/refs/tags/v0.1.0.tar.gz",
    .hash = "<corresponding-hash>",
}

• Update .hash for the new source. Run zig fetch or zig build to get the new hash value.
• Commit the fix with a message like fix(build): update spice dependency to use release archive.

This will resolve the unrecognized Content-Type error and allow the CI to fetch the dependency correctly.

This implementation bears strength in discipline.

(user memo: add a make verify-deps target for zig projects) (copilot ignore)

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