[dashboard-language] Built-in pages: render evals page

Milestone

Built-in pages

What shipped

Implemented the next built-in presenter slice for DLS-PAGE-009 and DLS-PAGE-014: the evals built-in page now renders separate eval definitions and eval observations from declarative built-in definitions.

Covered specification sections and requirements:

• Section 10 Built-in Pages
• DLS-PAGE-009
• DLS-PAGE-014

Behavior covered by this increment:

• Keeps eval definitions and eval observations distinguishable.
• Exposes observed subject.
• Exposes YES, NO, and UNKNOWN eval results.
• Exposes evaluation model information when available.
• Exposes time and provenance.
• Exposes independent availability, completeness, and freshness summaries.

Gates

Ran from pages/dashboard/:

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

Blockers

None.

Next milestone

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