spec-writer

Writes a task's spec — the one document an AI coder (Codex, a coder subagent) builds from without asking — then has it checked by a fresh agent that reads it as that coder. Use whenever a task's code is about to be handed to another executor and its scope is agreed - «напиши спеку», «спека задачи», «оформи в спеку», «write the spec», «spec for the coder», after a scope approval and before any code is delegated; also when a coder stopped on a gap and the spec needs a fix. Not for a design doc people read to decide (a plan, a proposal, a schema diff for review), not for code the session writes itself right now with nothing left to decide.