chore(09-02): configure coverage thresholds with baseline

- Set global thresholds: statements 10%, branches 5%, functions 20%, lines 8%
- Current coverage: statements ~12%, branches ~7%, functions ~24%, lines ~10%
- Thresholds prevent regression, target is 80% (CI-01 decision)
- Thresholds will be increased incrementally as more tests are added

vite.config.ts

@@ -11,8 +11,16 @@ export default defineConfig({
 			reporter: ['text', 'json', 'html'],
 			include: ['src/**/*.{ts,svelte}'],
 			exclude: ['src/**/*.test.ts', 'src/**/*.spec.ts'],
+			// Coverage thresholds - starting baseline, target is 80% (CI-01 decision)
+			// Current: statements ~12%, branches ~7%, functions ~24%, lines ~10%
+			// These thresholds prevent regression and will be increased incrementally
 			thresholds: {
-				autoUpdate: true
+				global: {
+					statements: 10,
+					branches: 5,
+					functions: 20,
+					lines: 8
+				}
 			}
 		},
 		projects: [