docs: add missing module READMEs

test-utils/README.md

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+# test-utils
+
+Test server for running Tabi apps in tests.
+
+## Installation
+
+```typescript
+import { TabiTestServer } from "@tabirun/app/test-utils";
+```
+
+## Usage
+
+```typescript
+Deno.test("GET /health returns 200", async () => {
+  const server = new TabiTestServer();
+
+  server.app.get("/health", (c) => c.json({ status: "ok" }));
+  server.start();
+
+  const res = await fetch(server.url("/health"));
+  assertEquals(res.status, 200);
+
+  await server.stop();
+});
+```
+
+## API
+
+- `new TabiTestServer()` - Create test server instance
+- `app` - The underlying `TabiApp` instance
+- `start(port?)` - Start server (uses random port if not specified)
+- `url(path)` - Get HTTP URL for path
+- `wsUrl(path)` - Get WebSocket URL for path
+- `stop()` - Gracefully shutdown server
+
+## Notes
+
+- Uses port 0 by default to avoid "address in use" errors
+- Always call `stop()` after tests to release resources

type-utils/README.md

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+# type-utils
+
+Type utilities for internal use.
+
+## Installation
+
+```typescript
+import { type PublicOf } from "@tabirun/app/type-utils";
+```
+
+## Usage
+
+```typescript
+class MyClass {
+  private _secret = "hidden";
+  public name = "visible";
+  public greet() {
+    return "hello";
+  }
+}
+
+type MyPublicAPI = PublicOf<MyClass>;
+// { name: string; greet: () => string }
+```
+
+## Types
+
+- `PublicOf<T>` - Extracts public interface of a class or object