perf(fmt): optimize discovery path resolution - #207
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Glob discovery currently calls
path.relativefor every candidate file, making path resolution file-linear for positive and negative globs. This PR creates a root-scoped resolver that slices paths beneathcwdand falls back topath.relativefor paths outside the root.On rsbuild,
path.relativecalls drop from 3,377 to 11 for**/*and from 3,328 to 12 for a negative glob; scoped and negative glob discovery improved by about 12.5% and 6.1%. End-to-end formatting remains within normal run-to-run variance because I/O and formatting dominate.