Add test infrastructure with coverage and DB test skipping

- Create @reviq/test-helpers package with shared test utilities
- Add describeE2E helper that auto-prefixes test names with [e2e]
- Support SKIP_DB_TESTS=1 to skip database-dependent tests
- Add unix socket support for TEST_DATABASE_URL
- Add root commands: test:unit, test:all, test:cov, test:unit:cov
- Configure bunfig.toml to exclude dist/ from coverage reports
- Clean up tsconfig.json files to remove redundant settings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/testing/test-helpers/src/index.ts

@@ -0,0 +1,18 @@
+export { describeE2E, SKIP_DB_TESTS } from "./skip-db-tests.js";
+export {
+  DEFAULT_TEST_AAGUID,
+  KNOWN_AAGUIDS,
+  TEST_RP,
+} from "./test-constants.js";
+export {
+  createTestDb,
+  createTestUser,
+  destroySharedDb,
+  destroyTestDb,
+  getSharedDb,
+  getTestDatabaseUrl,
+  initTestDb,
+  runMigrations,
+  truncateAllTables,
+} from "./test-db.js";
+export { withTestTransaction } from "./test-transaction.js";