feat(policy): support auto-add to policy by default and scoped persistence (#20361)

docs/reference/configuration.md

@@ -872,6 +872,11 @@ their corresponding top-level category object in your `settings.json` file.
     confirmation dialogs.
   - **Default:** `false`
 
+- **`security.autoAddToPolicyByDefault`** (boolean):
+  - **Description:** When enabled, the "Allow for all future sessions" option
+    becomes the default choice for low-risk tools in trusted workspaces.
+  - **Default:** `false`
+
 - **`security.blockGitExtensions`** (boolean):
   - **Description:** Blocks installing and loading extensions from Git.
   - **Default:** `false`