Adds --selftest mode that runs 5 regression test cases against a
temp directory. The temp dir is created OUTSIDE the parent git
working tree (e.g. via /tmp/.tmp-redbear-selftest-/) so that the
test's 'git log' commands don't pick up the parent repo's 100+
commits.
Test cases:
1. patch with sig in fork target preserved
2. patch without sig in fork target orphan
3. no-target patch (no +++ b/ header) orphan (no-target)
4. patch with content-integrated target orphan (classification)
5. verify --report action produces per-orphan decision
Bug fixed during dev: passing fork_dir to git log WITHOUT
isolating it from the parent repo's git tree caused 50 'case2'
keyword matches to leak in from the RedBear-OS parent repo's
commit log, making case2 falsely classified as INTEGRATED. Fixed
by using tempfile.mkdtemp(dir=os.path.dirname(REPO_ROOT)) to put
the test fork dir OUTSIDE the parent git tree.
Also fixed: audit_component now accepts an optional patches_dir
arg (so selftest can pass a non-default patches path without
modifying the main code path).
Also fixed: 'if not target_path or target_path == \'?\'' check
in suggest_action_for_orphan to handle the literal '?' sentinel
that audit_component uses for no-target orphans.
Wired into pre-push-checks.sh as check #3b (verify-patch-content-selftest).
Total: 7 pre-push checks now run before any push.
vasilito
38ebecabb6