Generate a walkthrough artifact (walkthrough.md) in `.agent/{branch}/` summarizing completed work for PR delivery. Gathers information from plan.md, git history, and test results to produce a comprehensive summary. Use at Phase 6 before creating the draft PR. Triggers on create walkthrough, generate
Generate a walkthrough artifact (walkthrough.md) in `.agent/{branch}/` summarizing completed work for PR delivery. Gathers information from plan.md, git history, and test results to produce a comprehensive summary. Use at Phase 6 before creating the draft PR. Triggers on create walkthrough, generate walkthrough, write walkthrough artifact.