Add fern deep command to CLI reference

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

@@ -12,6 +12,7 @@ hideOnThisPage: true
 | [`fern upgrade`](#fern-upgrade) | Update Fern CLI & generators to latest versions |
 | [`fern login`](#fern-login) | Login to Fern CLI via GitHub or Google |
 | [`fern logout`](#fern-logout) | Log out of the Fern CLI |
+| [`fern deep`](#fern-deep) | Email our co-founder, Deep |
 | [`fern export`](#fern-export) | Export an OpenAPI spec for your API |
 | [`fern api update`](#fern-api-update) | Manually update your OpenAPI spec |
 
@@ -387,6 +388,42 @@ hideOnThisPage: true
 
   </Accordion>
 
+  <Accordion title="fern deep">
+
+    Use `fern deep` to send an email directly to Deep, our co-founder. This command is
+    useful when you need to reach out for support, share feedback, or discuss your Fern experience.
+
+    <CodeBlock title="terminal">
+    ```bash
+    fern deep [--subject <subject>] [--message <message>]
+    ```
+    </CodeBlock>
+
+    ### subject
+
+    Use `--subject` to specify the subject line of your email.
+
+    ```bash
+    fern deep --subject "Question about SDK generation"
+    ```
+
+    ### message
+
+    Use `--message` to include a message body in your email.
+
+    ```bash
+    fern deep --message "I have a question about customizing TypeScript SDK output."
+    ```
+
+    If you don't provide `--subject` or `--message` flags, the command will open an interactive
+    prompt where you can compose your email.
+
+    <Note>
+    Deep reads every email personally and will get back to you as soon as possible!
+    </Note>
+
+  </Accordion>
+
   <Accordion title="fern token">
 
     Use `fern token` to generate a `FERN_TOKEN` specific to your organization defined