implement

Execute a feature end-to-end in the current session, without writing an implementation plan file. Use this whenever the user says "implement this", "build X", "let's code this up", "execute the spec", "carry out the design", "do the work", points at a spec file, or asks to ship/deliver something that has been designed. Two modes — from-spec (reads a design spec from craft memory and implements it) or from-conversation (implements directly from the current chat, skipping the spec step when the user already knows exactly what to build). Sets up a git worktree for isolation, uses TodoWrite as the task ledger, follows TDD cadence (failing test → impl → run → commit), and optionally prompts to update feature state at finish.