Fix red develop fdf7f681522c

The merge lane found `develop` red at `fdf7f681522ca9fd6f3083c5df5e41839242ea4d` on its own: no queued PR merges until it is fixed. Failing (tests and gate stages): - `tests/test_worktree_mechanics_source_guards.py::test_git_worktree_add_has_exactly_one_home_in_production_code` - `jaahd-unit-pytest` The whole gate log: artifact `10873` on lane task 10527. Make `develop` pass its full gate again. Open a PR as usual: the merge lane merges a PR that fixes some of these and adds no failure even while `develop` is red.

Fixed red develop: worktree-add source guard regex false-matched `git(worktree, "add", "-A")` in codex-reference connector; tightened argv form. Quick gate green; PR #7100 queued in merge lane. 4 host-local test_agent_launch failures noted (not in lane log, outside diff). Memory: none applied.