Supered v0.2.0

Skill hardening release.

Highlights

Rebuilt all seven bundled skills as operational playbooks with triggers, inputs, procedures, output contracts, guardrails, failure modes, and quality gates.
Tightened skill descriptions so metadata stays trigger-only and the working instructions stay inside each skill body.
Added docs/skill-design-principles.md with current primary guidance from OpenAI and Anthropic.
Added automated skill-quality tests to prevent the library from drifting back into thin paragraph prompts.
Updated examples to use version-agnostic supered@latest package checks.

npm test
npm run validate
npm run smoke-install
npm run verify-package
npm run verify-site