fix: resolve CI linting and type errors

src/promptforge/cli/commands/version.py

@@ -1,4 +1,7 @@
+"""Version control commands."""
+
 import click
+
 from promptforge.core.git_manager import GitManager
 
 
@@ -32,7 +35,13 @@ def history(ctx, prompt_name: str):
                 click.echo(f"  {commit['date']} by {commit['author']}")
         else:
             for commit in commits:
-                click.echo(f"{commit.hexsha[:7]} - {commit.message.strip()}")
+                hexsha = commit.hexsha
+                if isinstance(hexsha, bytes):
+                    hexsha = hexsha.decode('utf-8')
+                message = commit.message
+                if isinstance(message, bytes):
+                    message = message.decode('utf-8')
+                click.echo(f"{hexsha[:7]} - {message.strip()}")
                 click.echo(f"  {commit.author.name} - {commit.committed_datetime.isoformat()}")
     except Exception as e:
         click.echo(f"Error: {e}", err=True)
@@ -75,6 +84,22 @@ def branch(ctx, branch_name: str):
         raise click.Abort()
 
 
+@version.command("switch")
+@click.argument("branch_name")
+@click.pass_obj
+def switch(ctx, branch_name: str):
+    """Switch to a branch."""
+    prompts_dir = ctx["prompts_dir"]
+    git_manager = GitManager(prompts_dir)
+
+    try:
+        git_manager.switch_branch(branch_name)
+        click.echo(f"Switched to branch: {branch_name}")
+    except Exception as e:
+        click.echo(f"Error: {e}", err=True)
+        raise click.Abort()
+
+
 @version.command("list")
 @click.pass_obj
 def list_branches(ctx):
@@ -121,4 +146,4 @@ def status(ctx):
         click.echo(status_output)
     except Exception as e:
         click.echo(f"Error: {e}", err=True)
-        raise click.Abort()
+        raise click.Abort()