[dashboard-language] Built-in pages: render engines-models page

Summary

• milestone: Built-in pages
• render the engines-models built-in page from declarative built-in definitions
• group by separate engine, requested-model, and resolved-model dimensions while exposing run counts, run conclusions, downstream outcomes, raw-token totals, AIC totals, provenance, and independent data-state summaries

Specification coverage

• Section 10.2: DLS-PAGE-011, DLS-PAGE-014

Verification

• npm install ✅
• npm run typecheck ✅
• npm run lint ✅
• npm test ✅
• npm run test:e2e ✅

Blockers

• None in this run.

Next milestone

• Built-in pages: render another Section 10 built-in page such as operational-value, organizations, or repositories.

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