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ci: reproducibility check (build twice, compare SHA-256) - #17
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Adds scripts/check_reproducible.sh and a workflow that builds
wraithtwice in separate target dirs with--remap-path-prefixand SOURCE_DATE_EPOCH, and fails if SHA-256 differs.Tested locally on rustc 1.99: two builds, identical hash (REPRODUCIBLE). Shows reproducibility on the same host/toolchain only, not across machines or toolchain versions.