Pre-commit runs from a linked git worktree export an absolute GIT_DIR.
The release-control test helpers and the test-patched branch of
git_env() only removed GIT_INDEX_FILE, so their scratch-repo commands
targeted the REAL repository: 'git init' in a tempdir re-initialized it
with core.bare=true (breaking git status/commit for every checkout and
worktree) and the subsequent scratch 'git add' failed the hook.
Scrub GIT_DIR, GIT_WORK_TREE, GIT_INDEX_FILE, and GIT_COMMON_DIR in:
- git_env() of format_staged_go.py, governance_stage_guard.py, and
subsystem_contracts.py (test-patched branch only; production hook
behavior unchanged)
- the scratch-repo git() helpers in format_staged_go_test.py,
governance_stage_guard_test.py, readiness_assertion_guard_test.py,
subsystem_contracts_test.py
Matches the pattern contract_audit_test.py and status_audit_test.py
already used. Verified the full hook test battery passes with
GIT_DIR/GIT_WORK_TREE/GIT_INDEX_FILE pointed at a canary repo, which
stays un-corrupted.
rcourtman