Centralize version management and extract usage text

[linyows]

Summary

• Extract usage text to src/assets/usage.txt for easier maintenance
• Centralize version management by reading from build.zig.zon via build options
• Update release workflow to automatically set version from git tag
• Use 0.0.0-dev as placeholder version in repository (replaced during release)

Test plan

• zig build succeeds
• zig build test passes
• draft version shows 0.0.0-dev for local builds
• Release workflow sets correct version from tag

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR centralizes version management and extracts usage text to improve maintainability. The version is now read from build.zig.zon via build options, and the release workflow automatically updates it from git tags. The usage text has been moved to a separate asset file for easier editing.

Changes:

• Extracted usage text from inline string to src/assets/usage.txt
• Centralized version management by reading from build.zig.zon through build options
• Updated release workflow to set version from git tag before building

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/main.zig	Imports build options and usage text file; updates version and usage display functions
src/assets/usage.txt	New file containing the extracted usage text with updated ASCII art
build.zig.zon	Sets placeholder version 0.0.0-dev with comment explaining replacement during release
build.zig	Adds build options to pass version from build.zig.zon to compiled binary
.github/workflows/release.yml	Adds step to update version in build.zig.zon from git tag before building

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[Copilot]

The sed command uses -i.bak which creates a backup file on macOS/BSD but behaves differently on Linux. For cross-platform compatibility in GitHub Actions (which runs on Linux), use sed -i without the .bak extension, then remove the separate rm -f build.zig.zon.bak line.

Suggested change

	sed -i.bak "s/\.version = \"[^\"]*\",/.version = \"${VERSION}\",/" build.zig.zon
	rm -f build.zig.zon.bak
	sed -i "s/\.version = \"[^\"]*\",/.version = \"${VERSION}\",/" build.zig.zon