fix(coding-agent): split /clone from /fork UX

closes #2962

packages/coding-agent/README.md

@@ -169,7 +169,8 @@ Type `/` in the editor to trigger commands. [Extensions](#extensions) can regist
 | `/name <name>` | Set session display name |
 | `/session` | Show session info (path, tokens, cost) |
 | `/tree` | Jump to any point in the session and continue from there |
-| `/fork` | Create a new session from the current branch |
+| `/fork` | Create a new session from a previous user message |
+| `/clone` | Duplicate the current active branch into a new session |
 | `/compact [prompt]` | Manually compact context, optional custom instructions |
 | `/copy` | Copy last assistant message to clipboard |
 | `/export [file]` | Export session to HTML file |
@@ -238,7 +239,9 @@ pi --fork <path>       # Fork specific session file or ID into a new session
 - Filter modes (Ctrl+O): default → no-tools → user-only → labeled-only → all
 - Press Shift+L to label entries as bookmarks and Shift+T to toggle label timestamps
 
-**`/fork`** - Create a new session file from the current branch. Opens a selector, copies history up to the selected point, and places that message in the editor for modification.
+**`/fork`** - Create a new session file from a previous user message on the active branch. Opens a selector, copies the active path up to that point, and places the selected prompt in the editor for modification.
+
+**`/clone`** - Duplicate the current active branch into a new session file at the current position. The new session keeps the full active-path history and opens with an empty editor.
 
 **`--fork <path|id>`** - Fork an existing session file or partial session UUID directly from the CLI. This copies the full source session into a new session file in the current project.