What problem does it solve? It prevents unsafe direct edits to the tier-0 main branch by enforcing a controlled workflow where shared rules, AGENTS.md, system docs, prompts, and skill drafts are changed only through derived work branches and reviewed pull requests. ## Core Features & Use Cases - Branch Safety Enforcement: Prohibits direct commits, merges, and rebases on the main branch, requiring all changes to flow through main-v3/{taskname} work branches. - PR Scope Gating: Runs a scope gate before push and PR creation to block project SSoT or local silo data from leaking into tier-0 pull requests. - Codex Review Loop Integration: Coordinates automated PR review cycles with retry, timeout, and issue-classification rules before merge approval. - Use Case: When you need to update shared operating rules or add a new skill draft, this flow creates a work branch, validates the diff scope, opens a Korean-language PR, runs the review loop, and merges only after explicit user approval. ## Quick Start Ask the agent to update the shared system rules or AGENTS.md through the tier-0 update flow and create a pull request for review.