Revert "chore: add AI agent skills, Claude config, and fix ESLint for Next.js 16 (#20)"

[steadyfall]

Summary

• Reverts commit 99ced87
• Removes the added AI agent skill files, Claude skill links/settings, skills lockfile, and reverts the package/tooling changes from that commit

Validation

• npm ci
• npm run build
• npx tsc --noEmit
• npx prettier --check package.json package-lock.json

Notes

• Kept this as a pure git revert. Local npm run lint -- --ignore-pattern .next --ignore-pattern out fails after the revert because the restored ESLint config is itself reported by its Prettier/import rules, plus generated next-env.d.ts is linted locally.