fix(backend): harden final MVP invariants

backend/internal/logic/projects/workspace_test.go

@@ -3,7 +3,6 @@ package projects
 import (
 	"encoding/json"
 	"fmt"
-	"os"
 	"testing"
 	"time"
 
@@ -123,12 +122,6 @@ func TestWorkspaceDoneTaskDoesNotInventCompletedAt(t *testing.T) {
 	require.Contains(t, string(payload), `"completedAt":null`)
 }
 
-func TestWorkspaceFileDoesNotOwnDashboard(t *testing.T) {
-	source, err := os.ReadFile("workspace.go")
-	require.NoError(t, err)
-	require.NotContains(t, string(source), "func (s *Service) Dashboard")
-}
-
 func TestWorkspaceRejectsProjectOwnedByAnotherUserByIdentity(t *testing.T) {
 	newTestDB(t)
 	service := NewService()