build

# MasterMind — Build The single "do it the genius way, end to end" workflow. It runs the loop from `~/.mastermind/engineering/core/agent-loop.md`, pulling in the specialist agents and the field pack at each phase. Task: **$ARGUMENTS**. Scale effort to the task (`~/.mastermind/engineering/core/principles.md`): a trivial change skips straight to implement+verify; a foundation gets the full loop. Don't perform ceremony the task doesn't warrant. ## The loop 1. **Understand** — restate the real problem and its scope/lifespan; do the asked task and nothing more (`~/.mastermind/engineering/core/rigor.md` → Stay in scope). Read the relevant existing code and conventions first (delegate wide reading to a subagent to protect context); learn the stack if unfamiliar (`~/.mastermind/engineering/core/agent-loop.md` → Learn the stack first). Match the codebase. 2. **Design** (non-trivial only) — invoke the **`architect`** agent to produce the blueprint: module/component boundaries + interfaces, state model, data flow, key types, edge-case list. For a multi-file or unfamiliar change, write the design/spec down before coding. Skip for a clear one-file fix. 3. **Decide the stack** — apply the active field's `stack-defaults.md`. Choose the simplest thing that fully works; deviate only for a stated reason. Consult `mentors.md` if a call is contested. > **Plan-first gate (opt-in, off by default).** If the project's **`plan-first`** preference is on > (`.mastermind/prefs.m...