Phase Spec Execution

Turn a large task into a sequence of falsifiable execution slices instead of one broad blob of work.

Use When

• the task spans multiple files, layers, or user-visible milestones;
• there is real sequencing or dependency ordering;
• you need clearer state than "still working";
• the user wants autonomy without losing verification discipline.

Core Rules

• Slice vertically where possible. Each phase should move observable behavior.
• Give every phase explicit acceptance criteria.
• Attach the narrowest mandatory commands that can prove the phase.
• Update state after each phase so the next pass does not rediscover context.
• Do not create more phases than the task needs.