perf(fmt): prune ignored directories during discovery - #174
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Summary
rs fmtcurrently discovers every file before applying configured and CLI ignore rules, making large ignored trees unnecessarily expensive. This PR applies the composed ignore matcher during directory traversal while retaining final filtering for explicit files and Gitignore negation semantics. In a synthetic 8,000-file ignored tree, discovery dropped from approximately 35.3 ms to 3.5 ms.