Add fern deep command to CLI reference

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

@@ -14,6 +14,7 @@ hideOnThisPage: true
 | [`fern logout`](#fern-logout) | Log out of the Fern CLI |
 | [`fern export`](#fern-export) | Export an OpenAPI spec for your API |
 | [`fern api update`](#fern-api-update) | Manually update your OpenAPI spec |
+| [`fern deep`](#fern-deep) | Send an email to Deep, our co-founder |
 
 ## Documentation commands
 
@@ -587,4 +588,36 @@ hideOnThisPage: true
     ```
   </CodeBlock>
   </Accordion>
+
+  <Accordion title="fern deep">
+
+    Use `fern deep` to send an email directly to Deep, one of our co-founders. This command is useful when you need to reach out with feedback, questions, or ideas about Fern.
+
+    <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 "Feature request for new generator"
+    ```
+
+    ### message
+
+    Use `--message` to include a message body in your email.
+
+    ```bash
+    fern deep --subject "Quick question" --message "I have a question about SDK generation..."
+    ```
+
+    <Note>
+    If you don't provide a subject or message via flags, the CLI will prompt you interactively to compose your email.
+    </Note>
+
+  </Accordion>
 </AccordionGroup>