docs: add all workflow buttons with status to README

[jbampton]

https://github.com/jbampton/mruby/blob/12abf88d096ec5f21b43918907e72f85b2b4c4a7/README.md

[gemini-code-assist]

Summary of Changes

Hello @jbampton, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

I've updated the README.md file to provide a more comprehensive overview of the project's continuous integration status. This change replaces a single workflow badge with a complete set of badges for all active GitHub Actions workflows, making it easier for users and contributors to see the real-time status of various automated checks and builds.

Highlights

• README Update: The README.md file has been significantly updated to display the status of all GitHub Actions workflows.
• Workflow Badges Added: Ten new workflow status badges have been added, covering build, CIFuzz, Claude Code, Claude Code Review, CodeQL Analysis, Coverage, Lint, Release, Pull Request Labeler, and Super-Linter workflows.
• Consolidated Status Display: This change consolidates all relevant CI/CD statuses directly in the README, providing a quick glance at the project's health.

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[gemini-code-assist]

Warning

Gemini encountered an error creating the review. You can try again by commenting /gemini review.

[jbampton]

Removed the Claude code status buttons:

https://github.com/jbampton/mruby/blob/4f56c4b7471969c895b08847a93319c2dcf845fc/README.md