feat(plan): promote planning feature to stable (#24282)

docs/reference/commands.md

@@ -305,7 +305,7 @@ Slash commands provide meta-level control over the CLI itself.
 - **Description:** Switch to Plan Mode (read-only) and view the current plan if
   one has been generated.
   - **Note:** This feature is enabled by default. It can be disabled via the
-    `experimental.plan` setting in your configuration.
+    `general.plan.enabled` setting in your configuration.
 - **Sub-commands:**
   - **`copy`**:
     - **Description:** Copy the currently approved plan to your clipboard.

docs/reference/configuration.md

@@ -141,6 +141,11 @@ their corresponding top-level category object in your `settings.json` file.
   - **Default:** `false`
   - **Requires restart:** Yes
 
+- **`general.plan.enabled`** (boolean):
+  - **Description:** Enable Plan Mode for read-only safety during planning.
+  - **Default:** `true`
+  - **Requires restart:** Yes
+
 - **`general.plan.directory`** (string):
   - **Description:** The directory where planning artifacts are stored. If not
     specified, defaults to the system temporary directory. A custom directory
@@ -1657,11 +1662,6 @@ their corresponding top-level category object in your `settings.json` file.
     configured to allow it).
   - **Default:** `false`
 
-- **`experimental.plan`** (boolean):
-  - **Description:** Enable Plan Mode.
-  - **Default:** `true`
-  - **Requires restart:** Yes
-
 - **`experimental.taskTracker`** (boolean):
   - **Description:** Enable task tracker tools.
   - **Default:** `false`