/architect: Reduce Fable tokens by 80%, Fable orchestrates/reviews, Codex builds

Architect-loop is an autonomous software factory that uses AI agents (Fable/Codex and Claude) to automate development workflows, reducing token usage by 80% through an orchestrator-strategist-builder architecture with deterministic gates and no human approval checkpoints. The system uses commands like `/architect`, `/architect-fast`, and `/architect-research` to manage different-scoped development tasks, with fresh agents working in isolated worktrees and all changes shipping via single PRs. Recent updates restructured it as a stage-skill library with improved state management, job wrapping, and postflight validation to ensure code quality without manual review gates.