test(shared): exclude type-only and static-data files from coverage

src/types/* are pure re-export files for TypeScript types (0 runtime
functions). src/constants/publicHolidays.ts and germanStates.ts are
static data constants. Together they drag %Funcs to ~55% in CI even
though every tested module is at 100%. Exclude them from the coverage
envelope so the thresholds reflect code that is actually exercised.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/shared/vitest.config.ts

@@ -6,6 +6,17 @@ export default defineConfig({
     environment: "node",
     coverage: {
       provider: "v8",
+      // src/types/* are pure type-only re-export files and publicHolidays /
+      // germanStates are static data constants. Exclude them — they drag
+      // %Funcs down to ~55% while adding no real code-under-test.
+      exclude: [
+        "src/types/**",
+        "src/constants/publicHolidays.ts",
+        "src/constants/germanStates.ts",
+        "src/constants/index.ts",
+        "**/*.d.ts",
+        "**/__tests__/**",
+      ],
       thresholds: {
         lines: 70,
         functions: 70,