feat(switch): add interactive branch switch command

README.md

@@ -99,6 +99,8 @@ dgr pr list --view
 dgr init                        # initialize dagger in the current directory
 dgr branch <name>               # create a tracked branch from the current branch
 dgr branch <name> -p <parent>   # create a tracked branch under a specific parent
+dgr switch <branch>             # switch directly to a local branch
+dgr switch                      # choose a tracked branch from the interactive tree
 dgr tree                        # show the full tracked branch tree
 dgr tree --branch <branch>      # show one branch and its descendants
 dgr commit -m "message"         # commit and restack tracked descendants if needed
@@ -117,6 +119,8 @@ dgr reparent <branch> -p <parent> # reparent a named tracked branch onto a new p
 dgr orphan <branch>             # stop tracking a branch but keep the local branch
 ```
 
+When you run `dgr switch` without a branch name, dagger opens an inline tree picker for the tracked stack. Use the arrow keys or `j`/`k` to move, `Enter` to switch, and `Esc` or `q` to cancel.
+
 ### Sync stacks
 
 Run `dgr sync` to reconcile your local branches, dagger's tracked stack metadata, and GitHub pull requests:

src/cli/mod.rs

@@ -9,6 +9,7 @@ mod operation;
 mod orphan;
 mod pr;
 mod reparent;
+mod switch;
 mod sync;
 mod tree;
 
@@ -58,6 +59,9 @@ enum Commands {
     /// Continue a paused restack sequence
     Sync(sync::SyncArgs),
 
+    /// Switch to a branch directly or choose one from the tracked tree
+    Switch(switch::SwitchArgs),
+
     /// Print the tracked branch stacks as a shared tree from trunk
     Tree(tree::TreeArgs),
 }
@@ -81,6 +85,7 @@ pub fn run() -> ExitCode {
         Commands::Pr(args) => pr::execute(args),
         Commands::Reparent(args) => reparent::execute(args),
         Commands::Sync(args) => sync::execute(args),
+        Commands::Switch(args) => switch::execute(args),
         Commands::Tree(args) => tree::execute(args),
     };