feat: make feature branch prefix configurable

cmd/work.go

@@ -145,7 +145,13 @@ func runWorkNew(cmd *cobra.Command, args []string) error {
 	originPath := filepath.Join(basePath, repo)
 	worktreeName := fmt.Sprintf("%s-%s", repo, branch)
 	worktreePath := filepath.Join(basePath, worktreeName)
-	gitBranch := fmt.Sprintf("mgreau/%s", branch)
+	prefix := cfg.GetBranchPrefix()
+	var gitBranch string
+	if prefix != "" {
+		gitBranch = fmt.Sprintf("%s/%s", prefix, branch)
+	} else {
+		gitBranch = branch
+	}
 
 	// Check if worktree already exists
 	if _, err := os.Stat(worktreePath); err == nil {

internal/config/config.go

@@ -1,8 +1,10 @@
 package config
 
 import (
+	"context"
 	"fmt"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"strings"
 	"time"
@@ -18,6 +20,7 @@ type Config struct {
 	PollInterval string                `yaml:"poll_interval"`
 	ClaudeBin    string                `yaml:"claude_bin"`
 	Terminal     string                `yaml:"terminal"` // "iterm" or "ghostty"
+	BranchPrefix string                `yaml:"branch_prefix"`
 	Watch        WatchConfig           `yaml:"watch"`
 }
 
@@ -153,6 +156,25 @@ func (c *Config) GetTerminal() string {
 	return c.Terminal
 }
 
+// GetBranchPrefix returns the prefix for feature branch names.
+// Falls back to git config user.name (with spaces replaced by hyphens), then empty string.
+func (c *Config) GetBranchPrefix() string {
+	if c.BranchPrefix != "" {
+		return c.BranchPrefix
+	}
+	// Try git config user.name; replace spaces so the prefix is branch-safe.
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+	out, err := exec.CommandContext(ctx, "git", "config", "user.name").Output()
+	if err == nil {
+		name := strings.ReplaceAll(strings.TrimSpace(string(out)), " ", "-")
+		if name != "" {
+			return name
+		}
+	}
+	return ""
+}
+
 // expandPaths replaces ~ with $HOME in base paths.
 func (c *Config) expandPaths() {
 	home := os.Getenv("HOME")