3a10f6ad17
CB-578 stage C commits a preserved dirty worktree to refs/wip/<branch> with git add -A. The parity overlay copies the primary's environment files into every worktree, so a non-gitignored overlay path now reaches a durable git object instead of only sitting on disk. add -A respects .gitignore, which is what stops it — so the rule documented for CB-581 is now what keeps a secret out of a commit, not just out of a directory.