Build a piece

One piece per pass, always, directed by someone who judges it by behaviour.

1. Safe start

Read the whole piece, its Under the hood notes, its Risk areas: line, the masterplan's risk record and anything the masterplan or AGENTS.md's stack section points to. Uncommitted work stops the build; /what-now owns that conversation. Start from up-to-date main. If it cannot be reached, use the local copy and say so.

Choose the route before changing files: