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Git Hook Bug Let Test Suite Corrupt the Repository It Was Meant to Guard

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A pre-push Git hook in the Nobulex project failed 13 tests and, more critically, some of those tests inadvertently modified the very repository they were designed to protect. The root cause was that Git automatically exports environment variables like GIT_DIR into hook processes, which child test processes inherited, causing fixture commands to reach the parent repository's metadata instead of isolated temporary directories. The initial incident altered the worktree branch, index, and a shared core.bare setting, though these were restored and no unintended commits were pushed publicly. The fix uses git rev-parse --local-env-vars to identify and strip Git's repository-local environment variables from the test process before any fixture code runs. After patching, all 267 test cases passed and verification confirmed the caller's HEAD, index, and config remained untouched throughout.

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