test: Fix initial test failure

[toshimaru]

This pull request introduces several updates to improve the documentation, metadata, and testing for the serverkit-mise gem. The most significant changes include refining the gem specification, adding a build status badge to the README.md, and cleaning up unused or placeholder content in the codebase.

Documentation Updates:

• README.md: Added a Ruby build status badge linking to the GitHub Actions workflow.

Metadata Improvements:

• serverkit-mise.gemspec: Updated the gem specification with a proper summary, description, homepage URL, and metadata links (e.g., source code and changelog URIs). Removed placeholder metadata fields like allowed_push_host.

Codebase Cleanup:

• test/serverkit/test_mise.rb: Removed an unused test method (test_it_does_something_useful) that contained placeholder content.
• CHANGELOG.md: Removed the placeholder changelog content, including an empty "Unreleased" section.

[Copilot]

Pull Request Overview

This PR fixes the initial test failure and updates project metadata for improved consistency and clarity. The changes include:

• Removal of the dummy failing test in test/serverkit/test_mise.rb.
• Updates to serverkit-mise.gemspec with proper summary, description, homepage, and metadata.
• Addition of a CI badge in README.md and removal of the existing CHANGELOG.md.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
test/serverkit/test_mise.rb	Removed the placeholder failing test to address initial test failure.
serverkit-mise.gemspec	Updated gemspec fields to provide meaningful project metadata.
README.md	Added a badge for CI status; README still contains placeholder text.
CHANGELOG.md	Removed the changelog file, likely in favor of GitHub Releases for tracking.