chore: update typescript sdk to always download the fresh test-server and update sample's recordings.

sdks/typescript/postinstall.js

@@ -169,9 +169,8 @@ function ensureBinaryIsExecutable(binaryPath, platform) {
 async function main() {
     const binaryPath = getBinaryPath();
     if (fs.existsSync(binaryPath)) {
-        console.log(`${PROJECT_NAME} binary already exists at ${binaryPath}. Skipping download.`);
-        ensureBinaryIsExecutable(binaryPath, os.platform());
-        return;
+        console.log(`${PROJECT_NAME} binary already exists at ${binaryPath}. Removing it for a fresh install.`);
+        fs.unlinkSync(binaryPath); // This deletes the file
     }
 
     if (!fs.existsSync(BIN_DIR)) {

sdks/typescript/sample/README.md

@@ -0,0 +1,27 @@
+# Usage samples for `@google/genai/node`
+
+To run the samples first build the SDKs, from the sdks/typescript/:
+
+```sh
+# Build the SDK
+npm install
+npm run build
+```
+
+Then `cd sdks/typescript/samples`, install the newly built test-server typescript sdk:
+
+```sh
+# install the test-server typescript sdk
+cd samples
+rm -Rf node_modules # To clean up the old dependencies
+npm install
+```
+
+Now from sdks/typescript/samples, you can run 
+```sh
+rm -Rf dist # To clean up the old build
+
+npm run test
+#or
+npm run test:record
+```