Replay fuzz seeds in package checks - #16340
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Sanitizer CI builds the fuzz targets without running their checked-in seeds. Harness and corpus regressions can go unnoticed. Add bounded per-file replay checks for the NAR, derivation, and StorePath corpora. Also verify that the StorePath target is installed. Assisted-by: GitHub Copilot CLI (GPT-5.6 Sol)
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Motivation
Sanitizer CI builds the fuzz targets but does not run their checked-in seeds, so harness and corpus regressions can pass unnoticed.
Context
Extend the existing fuzzer-only package checks to replay each NAR, derivation, and StorePath seed once through its target. The checks only run on Linux with time and memory limits.
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