Lift the provider-specific blocks of agent_provision_plan into
contrib/claude/agent_provider.py and contrib/codex/agent_provider.py,
behind a new AgentProvider ABC and a lazy get_provider() registry
(mirrors PRD 0048's contrib convention).
agent_provision_plan and runtime_for stay as thin shims so existing
callers in backend/{docker,smolmachines}/prepare.py and cli/start.py
keep working without per-call edits — the shipping diff in this commit
is purely 'who owns the producer'.
Adds bot_bottle/_provision_apply.py — the backend-agnostic
skills / prompt / declarative-plan apply loops the per-provider
default methods will dispatch through in the next commit.
didericis-claude
44365ecf68