docs(ch01): add /yolo slash command to permissions reference

Document /yolo as an interactive alias for /allow-all on, introduced
in Copilot CLI v1.0.20. Key behavior:
- /yolo and --yolo now behave identically
- /yolo state persists across /restart

Updates:
- Chapter 01 slash commands table: add /yolo entry under Permissions
- Appendix additional-context.md: add /yolo example in Inside a Session

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: DanWahlin

01-setup-and-first-steps/README.md

@@ -413,10 +413,11 @@ That's it for getting started! As you become comfortable, you can explore additi
 |---------|--------------|
 | `/add-dir <directory>` | Add a directory to allowed list |
 | `/allow-all [on|off|show]` | Auto-approve all permission prompts; use `on` to enable, `off` to disable, `show` to check current status |
+| `/yolo` | Quick alias for `/allow-all on` — auto-approves all permission prompts. State persists across `/restart`. |
 | `/cwd`, `/cd [directory]` | View or change working directory |
 | `/list-dirs` | Show all allowed directories |
 
-> ⚠️ **Use with caution**: `/allow-all` skips confirmation prompts. Great for trusted projects, but be careful with untrusted code.
+> ⚠️ **Use with caution**: `/allow-all` and `/yolo` skip confirmation prompts. Great for trusted projects, but be careful with untrusted code.
 
 ### Session
 

appendices/additional-context.md

@@ -111,6 +111,10 @@ copilot
 
 > /list-dirs
 # See all allowed directories
+
+> /yolo
+# Quick alias for /allow-all on — auto-approves all permission prompts
+# This state also persists across /restart, so you won't need to re-enable it
 ```
 
 ### For Automation