DMC Homeboy provider list command omits required repository

[chubes4]

Problem

The active Homeboy DMC worktree provider is configured with:

wp datamachine-code workspace worktree list --with-status --format=json --path=/var/www/extrachill.com --allow-root

Current DMC requires positional <repo>, so Cook preview and promotion fail before they can resolve an existing issue worktree:

usage: wp datamachine-code workspace worktree list <repo> ...
Invalid argument 'to_worktree': worktree provider `dmc` list command failed with exit code 1

Observed Cook: agent-task-effc69bd-a189-497a-9fa0-16ecac26f9c1-transport-retry. Provider execution succeeded and produced a valid commit, but promotion and PR finalization were blocked by worktree discovery.

Expected behavior

The DMC-owned Homeboy provider registration must expose a valid bounded all-worktree listing command, or supply the repository argument through the provider contract. Generic Homeboy must not need DMC-specific command knowledge.

Acceptance criteria

• Cook preview resolves an existing or issue-derived DMC worktree without a CLI usage failure.
• Cook promotion can resolve an explicit --cwd/--to-worktree handle and apply a durable candidate.
• The registered commands.list argv matches the live DMC CLI contract.
• Add an integration contract covering provider list and promotion discovery.