Scaffold a new knowledge-commons graph in the current project, or wire an existing hand-built graph into promotion. Interviews the user, writes .commons.yml, scaffolds the atlas/maps/type directories, and generates project-owned process and knowledge-graph skills. Use when the user wants to "set up a knowledge graph", "init a graph in this project", "scaffold /process for this repo", "wire this graph to the commons", "instantiate the commons", or says "graph-init". Also fires for a bare config pass with no scaffolding via the --config-only flag.