feat(policy): add --policy flag for user defined policies (#18500)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

docs/get-started/configuration.md

@@ -96,6 +96,13 @@ their corresponding top-level category object in your `settings.json` file.
 
 <!-- SETTINGS-AUTOGEN:START -->
 
+#### `policyPaths`
+
+- **`policyPaths`** (array):
+  - **Description:** Additional policy files or directories to load.
+  - **Default:** `[]`
+  - **Requires restart:** Yes
+
 #### `general`
 
 - **`general.preferredEditor`** (string):