Optimize native exact-tree materialization - #28
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Cuts representative native exact-tree materialization from 8.93s p95 to 1.21s p95 on the measured M5/24 GB host. The measured cause was 611 serial Git launches per iteration; this batches committed blob metadata/content, reads numstats once, and limits patch concurrency to four while retaining exact revision identity, isolated object reads, shell-free Git, and existing caps.\n\nAdds a machine-readable 101-file/5,000-line benchmark with an M1/16 GiB reference budget and a stable 110-process cross-host regression gate, plus hostile-path/dirty-tree and process-ceiling coverage.\n\nValidated with the focused benchmark, hostile filename smoke, RTCIngestTests, scripts/native-check.sh, and npm run check. XCTest-only and full-Xcode UI/signing/notarization gates remain unclaimed on this Command Line Tools host.