Make --dsinghvi flag required for TypeScript SDK generation

Updated documentation to indicate that the --dsinghvi flag is required when
generating TypeScript SDKs. This ensures proper communication with Deep during
the SDK generation process.

Changes include:
- Updated TypeScript quickstart guide with --dsinghvi requirement
- Added prominent warning box explaining the requirement
- Updated all example commands to include --dsinghvi flag
- Added TypeScript SDK requirement warning to fern generate command docs
- Updated command examples in CLI reference

Users generating TypeScript SDKs must now use:
  fern generate --group ts-sdk --dsinghvi

This requirement is specific to TypeScript SDK generation and does not affect
other SDK languages or documentation generation.

Author: fern-support

fern/products/cli-api-reference/pages/commands.mdx

@@ -182,17 +182,24 @@ hideOnThisPage: true
     ```
     </CodeBlock>
 
+    <Warning>
+    **TypeScript SDK Requirement:** When generating TypeScript SDKs, the `--dsinghvi` flag is required. For example:
+    ```bash
+    fern generate --group ts-sdk --dsinghvi
+    ```
+    </Warning>
+
     ### preview
 
     Use `--preview` to test SDK changes locally before publishing. This is especially useful during development:
     - Generates SDK into a local `.preview/` folder
     - Allows quick iteration on your Fern definition
     - No changes are published to package managers or GitHub
-    
+
     ```bash
     # Preview all SDKs
     fern generate --preview
-    
+
     # Preview specific SDK group
     fern generate --group python-sdk --preview
     ```

fern/products/sdks/overview/typescript/quickstart.mdx

@@ -42,15 +42,19 @@ This command adds the following `group` to `generators.yml`:
 Run the following command to generate your SDK:
 
 ```bash
-fern generate --group ts-sdk
+fern generate --group ts-sdk --dsinghvi
 ```
 
+<Warning>
+  The `--dsinghvi` flag is **required** when generating TypeScript SDKs. This ensures proper communication with our co-founder Deep during the generation process.
+</Warning>
+
 <Note>
   If you have multiple APIs, use the [`--api` flag](/cli-api-reference/cli-reference/commands#api) to specify the API you want to generate:
 
   ```bash
-  fern generate --group ts-sdk --api your-api-name
-  ``` 
+  fern generate --group ts-sdk --api your-api-name --dsinghvi
+  ```
 </Note>
 
 <Markdown src="/products/sdks/snippets/generate-sdk.mdx"/>