feat(shell): add parallel bash shell subsystem auto-started per workspace

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

internal/api/router_test.go

@@ -9,6 +9,7 @@ import (
 
 	"codespace/internal/process"
 	"codespace/internal/service"
+	"codespace/internal/shell"
 	"codespace/internal/workspace"
 
 	"github.com/gin-gonic/gin"
@@ -24,10 +25,12 @@ func setupTestRouterWithMaxWriteBytes(t *testing.T, maxWriteBytes int64) http.Ha
 	root := t.TempDir()
 	wsMgr := workspace.NewLocalManager(root)
 	procMgr := process.NewManager("")
-	wsSvc := service.NewWorkspaceService(wsMgr, procMgr, nil)
+	shellMgr := shell.NewManager("bash", []string{"-i"})
+	wsSvc := service.NewWorkspaceService(wsMgr, procMgr, shellMgr, nil)
 	fileSvc := service.NewFileService(wsMgr, maxWriteBytes)
 	procSvc := service.NewProcessService(wsMgr, procMgr, nil)
-	return NewRouter(wsSvc, fileSvc, procSvc, nil, gin.TestMode)
+	shellSvc := service.NewShellService(wsMgr, shellMgr, nil)
+	return NewRouter(wsSvc, fileSvc, procSvc, shellSvc, nil, gin.TestMode)
 }
 
 func createWorkspaceForTest(t *testing.T, router http.Handler, id string) {