api: make workspace root configurable instead of hardcoded /workspace

- Add workspaceRoot field (default "/workspace") to Server struct
- Add SetWorkspaceRoot method on Server
- Update handleListWorkspaces to use s.workspaceRoot
- Add WorkspaceRoot field to Config with default "/workspace"
- Wire cfg.WorkspaceRoot into server in serve.go
- Expose --workspace-root flag on the serve command
- Add TestListWorkspaces_UsesConfiguredRoot integration test

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/internal/cli/serve.go b/internal/cli/serve.go
index 4253d56..e5bd873 100644
--- a/internal/cli/serve.go
+++ b/internal/cli/serve.go
@@ -20,16 +20,21 @@ import (
 
 func newServeCmd() *cobra.Command {
 	var addr string
+	var workspaceRoot string
 
 	cmd := &cobra.Command{
 		Use:   "serve",
 		Short: "Start the Claudomator API server",
 		RunE: func(cmd *cobra.Command, args []string) error {
+			if cmd.Flags().Changed("workspace-root") {
+				cfg.WorkspaceRoot = workspaceRoot
+			}
 			return serve(addr)
 		},
 	}
 
 	cmd.Flags().StringVar(&addr, "addr", ":8484", "listen address")
+	cmd.Flags().StringVar(&workspaceRoot, "workspace-root", "/workspace", "root directory for listing workspaces")
 
 	return cmd
 }
@@ -77,6 +82,9 @@ func serve(addr string) error {
 	if cfg.WebhookURL != "" {
 		srv.SetNotifier(notify.NewWebhookNotifier(cfg.WebhookURL, logger))
 	}
+	if cfg.WorkspaceRoot != "" {
+		srv.SetWorkspaceRoot(cfg.WorkspaceRoot)
+	}
 
 	// Register scripts.
 	wd, _ := os.Getwd()