Closes#178.
The backend provision functions now receive a Bottle handle with
exec / cp_in methods instead of a raw target string. Provisioner
modules use bottle.exec and bottle.cp_in in place of inlined
subprocess.run(["docker", "exec"/"cp", ...]) and direct
_smolvm.machine_cp / machine_exec calls. This decouples the
provisioners from backend-specific runtime primitives so future
refactors (e.g. the supervise rework) can swap the bottle's exec
implementation without touching every provisioner.
Each launch.py constructs the Bottle handle before calling
provision so it can be passed in; provision_prompt's return value
is wired back onto the bottle's prompt path attribute after the
fact.
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>