[dashboard-language] Reactive core

Milestone

Reactive core

Specification coverage

• Target architecture slice: tiny reactive core inspired by VanJS
• Verified behavior for state, derived values, effects, disposal, and keyed list reconciliation
• Requirement identifiers covered by tests in this increment:
  • DLS-CONF-004

What shipped

• Added pages/dashboard/src/reactive.js with deterministic reactive state, derived values, effect reruns, and disposal.
• Added pages/dashboard/src/dom.js with a small hyperscript-style DOM builder, attribute/dataset handling, and keyed list reconciliation supporting updates, removals, and reordering.
• Added unit tests for state updates, derived recomputation, effect disposal, DOM creation, and keyed list behavior.
• Added a browser e2e spec covering stable keyed rendering in the browser harness.
• Updated pages/dashboard/PLAN.md and pages/dashboard/README.md for the shipped slice.

Quality gates

• npm install ✅
• npm run typecheck ✅
• npm run lint ✅
• npm test ✅
• npm run test:e2e ⚠️ blocked by infrastructure

Blockers

• Playwright browser launch is blocked in this runner because the Chromium executable is not installed (browserType.launch: Executable doesn't exist). The e2e tests are present, but browser execution could not be completed in this environment.

Next milestone

Document model and validation

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