feat: embed compile-time version in CLI help

[0pendev]

Add -Dversion to build.zig (default dev) and wire the release workflow to pass the release tag so artifacts show the correct version in help output.

[Copilot]

Pull request overview

Note

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This PR embeds a compile-time version string into the CLI help output and wires the GitHub release workflow to pass the release tag into the Zig build so produced artifacts can display the correct version.

Changes:

• Add a -Dversion build option (defaulting to dev) and expose it via build_options.
• Print the embedded version as a banner before --help output.
• Update the release workflow to pass the release tag to zig build as -Dversion.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/main.zig	Prints a version banner (from build_options.version) before generating clap help output.
build.zig	Introduces -Dversion and injects it into the root module as build_options.
.github/workflows/release.yml	Passes a version value to the build command during releases.

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[Copilot]

RELEASE_TAG is not defined in this workflow step (no env: assignment shown), so -Dversion will likely be empty at build time. Use the GitHub expression directly (e.g., -Dversion="${{ inputs.release_tag }}") or define env: RELEASE_TAG: ${{ inputs.release_tag }} for the step/job.

[0pendev]

It is defined at the workflow level no ?