Agent Skills: spec-writing

This skill should be used when the user wants to create project specifications, feature specifications, design system documentation, or update existing specs. Triggers on "create spec", "plan project", "design system", "plan feature", "write specification", "generate SPEC.md", "document my project", "scaffold a spec", "plan my app", "spec out a feature", "create a project plan", "create a CLAUDE.md", "document architecture", "set up my project", "bootstrap a new app", "help me plan", "redesign my UI", "audit my design", "update my spec", or "revise the spec". Covers interview-based specification workflow with codebase analysis, tech stack recommendations, gap analysis, design audit, and optional SPEC/ supplements.