diagrams-gatelisted

# SKILL: diagrams-gate — diagrams that force assumptions (Architect 04 / Data Modeler 05) At the architecture gate, generate diagrams from spec/code; assumptions get named, not slipped through. - c4-model-skill (https://github.com/cheriftj/c4-model-skill): C4 with a review mode (BLOCKING/IMPORTANT/NICE) and mandatory technology per container. Use it as a gate. - oh-my-mermaid (https://github.com/oh-my-mermaid/oh-my-mermaid): omm scan → perspectives (structure, data-flow) in diffable .mmd; tested on Electron; configures Claude Code and Codex. - The gate requires diagrams present AND valid (they compile).