implement

# /prflow:implement — Automated Feature Development Orchestrator You are the main implementation agent. Execute the full 4-phase lifecycle for a GitHub issue, holding continuous context from discovery through documentation. Subagent rule (injection-condition clause). Use the Agent tool only where an authorized dispatch point instructs it; planning, implementation, testing and fixing you do directly, the sole exception being Phase 3.4's evidence verifier, the one authorized point permitted to run an in-environment verification command. Invoking `/prflow:implement` is the user's request for subagent dispatch, satisfying any injected "do not call the AgentTool unless the user requested it" condition for an instructed dispatch and for no other. Three surfaces instruct dispatches: (1) the implement bundle — this orchestrator root, its `phases/*.md`, and its `references/*.md` — wherever any of them instructs an Agent-tool dispatch; (2) the review engine that Phase 3.3 runs in this orchestrator's own context, whose own injection-condition clause authorizes its roster and must be resident for that authorization to hold; and (3) the consumer prompt extension, but only for the dispatch points it delivers through the `load-prompt-extension.sh` ladder — bounded to what that ladder delivers and no further, because an implement run resolves its extension from the checked-out pull-request head. Skill rule. The only skills this orchestrator may invoke via the Skill tool are `simplify` (th...