- Added optional `cache` parameter to `glob()`, `grep()`, and `fuzzyFind()` functions to enable shared filesystem scan caching.
- Added new `invalidateFsScanCache()` function to allow manual invalidation of filesystem scan cache entries.
- Improved filesystem path canonicalization in cache invalidation logic to handle relative paths and non-existent paths more robustly.
- Fixed variable shadowing bug in grep's `match_ext` method where extension parameter was compared against itself.
- Added early return optimization in glob when `maxResults` is zero to avoid unnecessary filesystem scanning.
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