Add a third provisioning subcase to
`backend/docker/provision/git.py`:
_provision_git_user(plan, target)
Runs `docker exec -u node <container> git config --global
user.{name,email} <value>` for each field the bottle's
`git_user` declares. No-op when `git_user.is_empty()`.
`-u node` so `--global` lands in /home/node/.gitconfig (matching
the existing `_provision_git_gate_config` write location, so
agent-side `git` reads both configs from the same dotfile).
Name and email apply independently — a bottle declaring only
name runs just the user.name line, etc.
4 unit tests in `test_docker_provision_git_user.py`: no-op,
both-set, name-only, email-only. 657 unit tests pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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