fix(wbfy): ignore local cache source checkouts

[exKAZUu]

Summary

• ignore .cache trees during repository capability detection
• remove stale generated Rust workflows and badges when no repository Rust code remains
• cover the cache-detection and upgrade paths with regression tests

Verification

• bun verify-full
• local bun start "/Users/exkazuu/ghq/github.com/WillBooster/tokzip-corpus"

[gemini-code-assist]

Summary of Changes

Hello, 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!

This pull request improves the accuracy of repository capability detection by explicitly ignoring local cache directories. It ensures that third-party source checkouts do not trigger the generation of unnecessary Rust workflows. Additionally, it introduces cleanup mechanisms to remove stale generated workflows and README badges, ensuring the repository state remains clean when Rust code is no longer present.

Highlights

• Cache Directory Exclusion: Updated glob patterns to ignore .cache directories, preventing third-party source checkouts from being incorrectly identified as repository Rust code.
• Stale Workflow Cleanup: Implemented logic to automatically remove generated Rust workflows and associated README badges when no actual Rust code is detected in the repository.
• Regression Testing: Added unit tests to verify that cached Cargo projects no longer trigger workflow generation and that stale artifacts are properly cleaned up.

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The cache was hiding code unseen, Which made the workflows turn to green. But now we prune the stale and old, And keep the repo clean and bold.

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[gemini-code-assist]

Code Review

This pull request prevents wbfy from incorrectly detecting Rust code in local caches (such as .cache) by adding **/.cache/** to the glob ignore list. It also ensures that if a repository has no Rust code, any stale generated test-rust.yml workflow and its corresponding README badge are cleaned up. Unit tests have been added to verify these behaviors. I have no feedback to provide as there are no review comments.