docs(engine): add CLI section for listing issues (#4171)

## Summary

Adds a short \"Manage issues via the CLI\" section to the Engine docs
covering `langsmith project issues list`.

## Release Note

none

## Test Plan

- [x] Renders correctly in the docs

---------

Co-authored-by: Florence Morris <1629446+fjmorris@users.noreply.github.com>

Author: Palashio

src/langsmith/engine.mdx

@@ -146,6 +146,15 @@ Click **Resolve** to mark an issue as fixed, or **Ignore** to dismiss it as not
 
 To reopen a previously closed issue, open the issue detail view and click **Reopen**.
 
+## List issues via the CLI
+
+You can list issues programmatically using the [LangSmith CLI](/langsmith/cli).
+
+```bash
+# List issues for a project
+langsmith project issues list --project <project-name>
+```
+
 ## Configure the LangSmith Engine
 
 <Note>