feat: add c4-diagram skill#3
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Agent skill for producing C4 architecture diagrams in Mermaid notation. Uses flowchart + subgraphs (not experimental C4* syntax per bproxy lessons). Includes: - SKILL.md with rendering primitives, workflow, and hard rules - validate_mermaid.mjs script (mermaid.parse with loose security) - 6 validated diagram templates (context, container, component, deployment, dynamic, landscape) - Reference docs: abstractions, diagram selection, anti-patterns, mermaid gotchas
Extends from single distill-knowledge skill to a collection of skills for solution architecture tasks. Adds c4-diagram overview, shared design principles, and per-skill quick examples.
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Summary
Adds a new Agent Skill for producing C4 software architecture diagrams in Mermaid notation.
What's included
skills/c4-diagram/SKILL.md— core instructions: rendering primitives, workflow, hard rules, anti-patternsscripts/validate_mermaid.mjs— syntax validator usingmermaid.parse()with loose security levelKey design decisions
flowchart+ subgraphs exclusively (not experimentalC4*syntax which breaks across Mermaid versions)--strictmode)Also in this PR
.gitignoreupdated fornode_modules