Rewind documentation (#17446)

docs/cli/rewind.md

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+# Rewind
+
+The `/rewind` command allows you to go back to a previous state in your
+conversation and, optionally, revert any file changes made by the AI during
+those interactions. This is a powerful tool for undoing mistakes, exploring
+different approaches, or simply cleaning up your session history.
+
+## Usage
+
+To use the rewind feature, simply type `/rewind` into the input prompt and press
+**Enter**.
+
+Alternatively, you can use the keyboard shortcut: **Press `Esc` twice**.
+
+## Interface
+
+When you trigger a rewind, an interactive list of your previous interactions
+appears.
+
+1.  **Select Interaction:** Use the **Up/Down arrow keys** to navigate through
+    the list. The most recent interactions are at the bottom.
+2.  **Preview:** As you select an interaction, you'll see a preview of the user
+    prompt and, if applicable, the number of files changed during that step.
+3.  **Confirm Selection:** Press **Enter** on the interaction you want to rewind
+    back to.
+4.  **Action Selection:** After selecting an interaction, you'll be presented
+    with a confirmation dialog with up to three options:
+    - **Rewind conversation and revert code changes:** Reverts both the chat
+      history and the file modifications to the state before the selected
+      interaction.
+    - **Rewind conversation:** Only reverts the chat history. File changes are
+      kept.
+    - **Revert code changes:** Only reverts the file modifications. The chat
+      history is kept.
+    - **Do nothing (esc):** Cancels the rewind operation.
+
+If no code changes were made since the selected point, the options related to
+reverting code changes will be hidden.
+
+## Key Considerations
+
+- **Destructive Action:** Rewinding is a destructive action for your current
+  session history and potentially your files. Use it with care.
+- **Agent Awareness:** When you rewind the conversation, the AI model loses all
+  memory of the interactions that were removed. If you only revert code changes,
+  you may need to inform the model that the files have changed.
+- **Manual Edits:** Rewinding only affects file changes made by the AI's edit
+  tools. It does **not** undo manual edits you've made or changes triggered by
+  the shell tool (`!`).
+- **Compression:** Rewind works across chat compression points by reconstructing
+  the history from stored session data.