Tier-2 GPU perf tests ran on standard GitHub-hosted Linux runners with no real GPU hardware, consistently timing out and burning CI credits for unreliable results. Remove the entire tier-2 infrastructure. Also renames the perf-tier-1 PR label to perf (already done on GitHub) and documents that pnpm test:visual is the primary tool for verifying rendering correctness via PNG snapshots. Removed: - tests/perf/ (Playwright perf spec) - tests/visual/fixtures/perf-*.html and perf-common.js - playwright.perf.config.ts - scripts/compare-tier-2-perf-results.mjs - Entire perf: CI job (~200 lines from ci.yml) Updated: - ci.yml: label guard and benchmark job trigger use perf label - CLAUDE.md: tier-2 removed; Visual Regression Tests section added - docs/performance-testing.md: rewritten without tier-2 - .claude/skills/perf/SKILL.md: CPU benchmarks only - tsconfig.json, eslint.config.js: remove tests/perf glob Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Signed-off-by: Vaclav Vancura <commit@vancura.dev>