[dashboard-language] Built-in pages: runs render slice

Milestone

Built-in pages

Specification coverage

• Section 10 Built-in Pages
• DLS-PAGE-006
• DLS-PAGE-014

What shipped

• Added visible presenter rendering for the built-in runs page.
• Rendered run status counts, run conclusion counts, downstream outcome counts, and a runs table with scope, rollout mode, engine, requested model, resolved model, started time, outcome count, and run links.
• Reused the keyed-list DOM primitive for deterministic run-row reconciliation.
• Added jsdom unit coverage for deterministic presenter output.
• Replaced the browser smoke test with a Playwright scenario covering the rendered runs page.
• Updated PLAN.md and README.md for the new slice.

Gates

• npm install ✅
• npm run typecheck ✅
• npm run lint ✅
• npm test ✅
• npm run test:e2e ⚠️ blocked: Playwright Chromium executable is not provisioned in this environment (browserType.launch: Executable doesn't exist)

Blockers

• Playwright package-level browser execution remains blocked by missing Chromium in the runner, so the end-to-end spec was added and exercised up to browser launch failure only.

Next milestone

Built-in pages: render one additional Section 10 built-in page from the declarative definitions, or extract the first reusable presentation component needed by that next rendering slice.

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