fix(review): fix section numbering, nav entry, and step hierarchy

- commands.md: renumber 1.6→1.7→1.8→1.9 after inserting 1.5 Built-in Skills
- SKILL.md: promote Reverse audit from ### to ## Step 2.6 for consistent
  step hierarchy
- _meta.ts: add code-review to Features navigation sidebar

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/users/features/commands.md

@@ -151,7 +151,7 @@ The `/btw` command allows you to ask quick side questions without interrupting o
 >
 > Use `/btw` when you need a quick answer without derailing your main task. It's especially useful for clarifying concepts, checking facts, or getting quick explanations while staying focused on your primary workflow.
 
-### 1.6 Information, Settings, and Help
+### 1.7 Information, Settings, and Help
 
 Commands for obtaining information and performing system settings.
 
@@ -166,7 +166,7 @@ Commands for obtaining information and performing system settings.
 | `/copy`     | Copy last output content to clipboard           | `/copy`                          |
 | `/quit`     | Exit Qwen Code immediately                      | `/quit` or `/exit`               |
 
-### 1.7 Common Shortcuts
+### 1.8 Common Shortcuts
 
 | Shortcut           | Function                | Note                   |
 | ------------------ | ----------------------- | ---------------------- |
@@ -176,7 +176,7 @@ Commands for obtaining information and performing system settings.
 | `Ctrl/cmd+Z`       | Undo input              | Text editing           |
 | `Ctrl/cmd+Shift+Z` | Redo input              | Text editing           |
 
-### 1.8 CLI Auth Subcommands
+### 1.9 CLI Auth Subcommands
 
 In addition to the in-session `/auth` slash command, Qwen Code provides standalone CLI subcommands for managing authentication directly from the terminal: