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/skip-db-tests.ts

@@ -0,0 +1,18 @@
+import { describe } from "bun:test";
+
+/**
+ * Skip flag for database-dependent tests.
+ * Set SKIP_DB_TESTS=1 to skip e2e tests that require a database.
+ */
+export const SKIP_DB_TESTS: boolean = process.env.SKIP_DB_TESTS === "1";
+
+const _describeSkipIf = describe.skipIf(SKIP_DB_TESTS);
+
+/**
+ * Use for describe blocks that require database access.
+ * Automatically prefixes name with [e2e].
+ * Skips tests when SKIP_DB_TESTS=1 is set.
+ */
+export function describeE2E(name: string, fn: () => void): void {
+  _describeSkipIf(`[e2e] ${name}`, fn);
+}