giles
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4 tests verifying server-client rendering parity: 1. SSR renders visible content without JavaScript (headings, islands, logo) 2. JS-rendered content matches SSR structure (same article text) 3. CSSX styling works without JS (violet class, rules in <head>) 4. SPA navigation preserves island state (colour + copyright path) Run: cd tests/playwright && npx playwright test Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>