test(hooks): finalize mutation test improvements and release acceptance

- Raise use-swipe-gesture mutation score to 66.13% (target 65%+)
- Maintain use-reduced-motion mutation score at 76.32% (target 50%+)
- Fix use-reduced-motion.ts ESLint set-state-in-effect warning
- Add UJ-10 deep searcher journey (category browse → article read → content discovery)
- Add 40 new test files (analytics, detail, sections, ui, lib components)
- Update test-strategy-plan.md to v2.0 (sync test count to 1591)
- Sync README.md with final release metrics

Quality gates: TS 0 errors, ESLint 0 errors, 121 suites / 1591 tests passed

eslint.config.mjs

@@ -89,11 +89,13 @@ const config = [
     name: 'ruixin/ignores',
     ignores: [
       '.next/**',
+      '.stryker-tmp/**',
       'out/**',
       'build/**',
       'dist/**',
       'node_modules/**',
       'coverage/**',
+      'src/generated/**',
       'scripts/**',
       'config/test/**',
       '**/_archive/**',