Update vitest coverage thresholds to 80%

- Increase line and statement thresholds from 79% to 80%
- Maintain function and branch thresholds at 80%
- Target 83% actual coverage for healthy margin above threshold

Author: jdalton

.config/vitest.config.mts

@@ -103,10 +103,10 @@ export default defineConfig({
         : ['registry/dist/**/*.{js,mjs,cjs}'],
       all: true,
       thresholds: {
-        lines: 79,
+        lines: 80,
         functions: 80,
         branches: 80,
-        statements: 79,
+        statements: 80,
       },
     },
   },