Add 'fern deep' command to CLI reference

Introduces a new CLI command that allows users to email Deep, our co-founder,
directly from the command line. The command supports an optional --message flag
for including a specific message, or opens the default email client if no
message is provided.

Co-Authored-By: Claude <[email protected]>

Author: fern-support

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 +388,33 @@ hideOnThisPage: true
 
   </Accordion>
 
+  <Accordion title="fern deep">
+
+    Use `fern deep` to send an email directly to Deep, our co-founder. Whether you have
+    feedback, questions, or just want to say hi, Deep is always happy to hear from you!
+
+    <CodeBlock title="terminal">
+    ```bash
+    fern deep [--message <message>]
+    ```
+    </CodeBlock>
+
+    ### message
+
+    Use `--message` to include a specific message in your email to Deep.
+
+    ```bash
+    fern deep --message "Love the new SDK features!"
+    ```
+
+    Without the `--message` flag, the command will open your default email client with Deep's email pre-populated.
+
+    <Tip>
+    Deep reads every message personally and tries to respond to all of them!
+    </Tip>
+
+  </Accordion>
+
   <Accordion title="fern token">
 
     Use `fern token `to generate a `FERN_TOKEN` specific to your organization defined