Stabilize and modernize portfolio baseline

[JMG3000]

Tracking

• Jira: JMGPORT-1

Summary

• Replace the mixed legacy/starter portfolio state with a responsive Next.js portfolio baseline while preserving project history.
• Make GitHub Pages static export deterministic with focused tests, cross-platform validation, and least-privilege deployment controls.
• Remediate the dependency boundary with Next.js 16.2.12, js-yaml 5.2.3, eslint-config-next 16.2.12, PostCSS 8.5.23, and a regenerated reproducible lockfile.

Root cause

The repository combined retained Jekyll artifacts, generated Next.js output, placeholder routes/content, and a request-time API route that cannot run on static GitHub Pages. A newly disclosed dependency advisory also made the earlier publication gate fail. A global brace-expansion override was rejected because it breaks minimatch 3's CommonJS API contract; the resolved dependency graph now uses compatible patched versions without an adapter.

Validation

• npm ci — clean install from the committed lockfile
• npm audit --omit=dev --audit-level=high — 0 vulnerabilities
• npm audit --audit-level=high — 0 vulnerabilities
• npm run check — lint, typecheck, 5 test files / 11 tests, static production build
• Static routes: /, /404, /portfolio

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