⚡ Bolt: [performance improvement] Cache compiled regex filters in buildIgnoreFilter

[raccioly]

💡 What

Implemented an internal filterCache (Map) within buildIgnoreFilter in cli/shared-ignore.mjs. This cache uses the JSON-stringified patterns array as the cache key to store and reuse the compiled regex filter functions. Added a corresponding entry to the Bolt journal (.jules/bolt.md).

🎯 Why

During recursive directory scans, functions like shouldIgnore continually re-evaluate the same global and validator-specific configuration patterns. Previously, this caused the regexes to be re-compiled for every check, leading to redundant computation and performance bottlenecks in large codebases.

📊 Impact

Reduces regex compilation overhead to O(1) per unique pattern array, significantly speeding up recursive file traversals and the overall execution time of the CLI, especially in large repositories with extensive ignore configurations.

🔬 Measurement

Run pnpm test to ensure all 61 tests pass. Profile the docguard guard command on a large directory structure; you will observe a noticeable reduction in CPU time spent inside globToRegex and buildIgnoreFilter.

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PR created automatically by Jules for task 7056376380095519862 started by @raccioly

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