Add READMEs for remaining packages

- db-schema: Database schema types from kysely-codegen
- db: Database client and helper functions
- testing: Overview of testing packages
- test-helpers: Database testing utilities
- virtual-authenticator: WebAuthn virtual authenticator

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

packages/testing/README.md

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+# Testing Packages
+
+Shared testing utilities for the RevIQ platform.
+
+## Packages
+
+### @reviq/test-helpers
+
+Database testing utilities including test database setup, transactions, and fixtures.
+
+```typescript
+import { createTestDb, withTestTransaction, describeE2E } from "@reviq/test-helpers";
+```
+
+### @reviq/virtual-authenticator
+
+WebAuthn virtual authenticator for testing passkey flows without real hardware.
+
+```typescript
+import { VirtualAuthenticator } from "@reviq/virtual-authenticator";
+```
+
+## Usage
+
+These packages are used internally for e2e and integration tests. Add them as dev dependencies:
+
+```json
+{
+  "devDependencies": {
+    "@reviq/test-helpers": "workspace:*",
+    "@reviq/virtual-authenticator": "workspace:*"
+  }
+}
+```

packages/testing/test-helpers/README.md

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+# @reviq/test-helpers
+
+Database testing utilities for integration and e2e tests.
+
+## Usage
+
+```typescript
+import {
+  describeE2E,
+  createTestDb,
+  withTestTransaction,
+  createTestUser,
+} from "@reviq/test-helpers";
+
+describeE2E("My API tests", () => {
+  it("should create a user", async () => {
+    await withTestTransaction(async (trx) => {
+      const user = await createTestUser(trx, {
+        email: "test@example.com",
+      });
+      expect(user.id).toBeDefined();
+    });
+  });
+});
+```
+
+## Exports
+
+### Test Setup
+- `describeE2E(name, fn)` - Wrapper for describe() that skips when `SKIP_DB_TESTS=1`
+- `SKIP_DB_TESTS` - Boolean indicating if db tests should be skipped
+
+### Database Utilities
+- `createTestDb()` - Create an isolated test database
+- `destroyTestDb(db)` - Destroy a test database
+- `getSharedDb()` - Get the shared test database instance
+- `destroySharedDb()` - Destroy the shared database
+- `initTestDb()` - Initialize the test database
+- `runMigrations(url)` - Run database migrations
+- `truncateAllTables(db)` - Clear all data from tables
+- `getTestDatabaseUrl()` - Get the test database connection URL
+
+### Transaction Helpers
+- `withTestTransaction(fn)` - Run a function in a rolled-back transaction
+
+### Fixtures
+- `createTestUser(trx, opts)` - Create a test user
+
+### Constants
+- `TEST_RP` - Test relying party configuration for WebAuthn
+- `DEFAULT_TEST_AAGUID` - Default AAGUID for virtual authenticator
+- `KNOWN_AAGUIDS` - Map of known authenticator AAGUIDs

packages/testing/virtual-authenticator/README.md

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+# @reviq/virtual-authenticator
+
+WebAuthn virtual authenticator for testing passkey registration and authentication flows.
+
+## Usage
+
+```typescript
+import { VirtualAuthenticator } from "@reviq/virtual-authenticator";
+
+const authenticator = new VirtualAuthenticator({
+  aaguid: "00000000-0000-0000-0000-000000000000",
+});
+
+// Create a credential during registration
+const credential = await authenticator.create(
+  publicKeyCredentialCreationOptions,
+);
+
+// Use the credential during authentication
+const assertion = await authenticator.get(
+  publicKeyCredentialRequestOptions,
+);
+```
+
+## Exports
+
+### Classes
+- `VirtualAuthenticator` - Simulates a WebAuthn authenticator
+
+### Utilities
+- `base64urlToUint8Array(str)` - Decode base64url to bytes
+- `uint8ArrayToBase64url(bytes)` - Encode bytes to base64url
+- `parseAaguid(str)` - Parse an AAGUID string to bytes
+
+### Constants
+- `DEFAULT_AAGUID` - Default AAGUID for the virtual authenticator
+
+### Types
+- `VirtualAuthenticatorOptions` - Configuration options for the authenticator