docs: add /rewind timeline picker and update /allow-all subcommands

- Add /rewind command to Chapter 01 Session commands reference table
- Update /rename description to mention auto-generate option (no argument)
- Update /allow-all to document on/off/show subcommands (v1.0.12)
- Add /rewind to Chapter 02 context management section with explanation
- Add /rewind to Context Efficiency Tips table in Chapter 02
- Update Chapter 02 Key Takeaways to include /rewind

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

Author: github-actions[bot]

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

@@ -411,7 +411,7 @@ That's it for getting started! As you become comfortable, you can explore additi
 
 | Command | What It Does |
 |---------|--------------|
-| `/allow-all` | Auto-approve all permission prompts for this session |
+| `/allow-all [on\|off\|show]` | Auto-approve all permission prompts; use `on` to enable, `off` to disable, `show` to check current status |
 | `/add-dir <directory>` | Add a directory to allowed list |
 | `/list-dirs` | Show all allowed directories |
 | `/cwd`, `/cd [directory]` | View or change working directory |
@@ -423,7 +423,8 @@ That's it for getting started! As you become comfortable, you can explore additi
 | Command | What It Does |
 |---------|--------------|
 | `/resume` | Switch to a different session (optionally specify session ID) |
-| `/rename` | Rename the current session |
+| `/rename` | Rename the current session (omit the name to auto-generate one) |
+| `/rewind` | Open a timeline picker to roll back to any earlier point in the conversation |
 | `/context` | Show context window token usage and visualization |
 | `/usage` | Display session usage metrics and statistics |
 | `/session` | Show session info and workspace summary |

02-context-conversations/README.md

@@ -330,7 +330,7 @@ copilot
 
 ### Check and Manage Context
 
-As you add files and conversation, Copilot CLI's [context window](../GLOSSARY.md#context-window) fills up. Two commands help you stay in control:
+As you add files and conversation, Copilot CLI's [context window](../GLOSSARY.md#context-window) fills up. Three commands help you stay in control:
 
 ```bash
 copilot
@@ -340,10 +340,15 @@ Context usage: 45,000 / 128,000 tokens (35%)
 
 > /clear
 # Wipes context and starts fresh. Use when switching topics
+
+> /rewind
+# Opens a timeline picker — roll back to any earlier point in your conversation
 ```
 
 > 💡 **When to use `/clear`**: If you've been reviewing `books.py` and want to switch to discussing `utils.py`, run `/clear` first. Otherwise stale context from the old topic may confuse responses.
 
+> 💡 **Made a mistake or want to try a different approach?** Use `/rewind` (or press Esc twice) to open a **timeline picker** that lets you roll back to any earlier point in your conversation — not just the most recent one. This is handy when you went down the wrong path and want to backtrack without starting over entirely.
+
 ---
 
 ### Pick Up Where You Left Off
@@ -559,6 +564,7 @@ copilot
 | Situation | Action | Why |
 |-----------|--------|-----|
 | Starting new topic | `/clear` | Removes irrelevant context |
+| Went down wrong path | `/rewind` | Roll back to any earlier point |
 | Long conversation | `/compact` | Summarizes history, frees tokens |
 | Need specific file | `@file.py` not `@folder/` | Loads only what you need |
 | Hitting limits | Start new session | Fresh 128K context |
@@ -846,7 +852,7 @@ copilot --add-dir /path/to/directory
 1. **`@` syntax** gives Copilot CLI context about files, directories, and images
 2. **Multi-turn conversations** build on each other as context accumulates
 3. **Sessions auto-save**: use `--continue` or `--resume` to pick up where you left off
-4. **Context windows** have limits: manage them with `/context`, `/clear`, and `/compact`
+4. **Context windows** have limits: manage them with `/context`, `/clear`, `/rewind`, and `/compact`
 5. **Permission flags** (`--add-dir`, `--allow-all`) control multi-directory access. Use them wisely!
 6. **Image references** (`@screenshot.png`) help debug UI issues visually