feat: add WINDSOR_CONTEXT_ID environment variable

pkg/env/windsor_env.go

@@ -21,6 +21,7 @@ import (
 // WindsorPrefixedVars are the environment variables that are managed by Windsor.
 var WindsorPrefixedVars = []string{
 	"WINDSOR_CONTEXT",
+	"WINDSOR_CONTEXT_ID",
 	"WINDSOR_PROJECT_ROOT",
 	"WINDSOR_SESSION_TOKEN",
 	"WINDSOR_MANAGED_ENV",
@@ -87,6 +88,9 @@ func (e *WindsorEnvPrinter) GetEnvVars() (map[string]string, error) {
 	currentContext := e.configHandler.GetContext()
 	envVars["WINDSOR_CONTEXT"] = currentContext
 
+	contextID := e.configHandler.GetString("id", "")
+	envVars["WINDSOR_CONTEXT_ID"] = contextID
+
 	projectRoot, err := e.shell.GetProjectRoot()
 	if err != nil {
 		return nil, fmt.Errorf("error retrieving project root: %w", err)

pkg/env/windsor_env_test.go

@@ -7,6 +7,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/windsorcli/cli/pkg/config"
 	"github.com/windsorcli/cli/pkg/di"
 	"github.com/windsorcli/cli/pkg/secrets"
 )
@@ -118,6 +119,47 @@ func TestWindsorEnv_GetEnvVars(t *testing.T) {
 		if envVars["WINDSOR_SESSION_TOKEN"] != expectedSessionToken {
 			t.Errorf("Expected WINDSOR_SESSION_TOKEN to be %q, got %q", expectedSessionToken, envVars["WINDSOR_SESSION_TOKEN"])
 		}
+
+		// And context ID should be set but empty (YamlConfigHandler returns empty for non-existent keys)
+		expectedContextID := ""
+		if envVars["WINDSOR_CONTEXT_ID"] != expectedContextID {
+			t.Errorf("Expected WINDSOR_CONTEXT_ID to be %q, got %q", expectedContextID, envVars["WINDSOR_CONTEXT_ID"])
+		}
+	})
+
+	t.Run("ContextIDNotSet", func(t *testing.T) {
+		// Given a WindsorEnvPrinter with no context ID
+		mockConfigHandler := config.NewMockConfigHandler()
+		mockConfigHandler.GetStringFunc = func(key string, defaultValue ...string) string {
+			if key == "id" {
+				return ""
+			}
+			return "mock-string"
+		}
+
+		mocks := setupWindsorEnvMocks(t, &SetupOptions{
+			ConfigHandler: mockConfigHandler,
+		})
+		printer := NewWindsorEnvPrinter(mocks.Injector)
+		if err := printer.Initialize(); err != nil {
+			t.Fatalf("Failed to initialize env: %v", err)
+		}
+		printer.shims = mocks.Shims
+
+		// When GetEnvVars is called
+		envVars, err := printer.GetEnvVars()
+
+		// Then no error should be returned
+		if err != nil {
+			t.Fatalf("Expected no error, got %v", err)
+		}
+
+		// And WINDSOR_CONTEXT_ID should be set but empty
+		if contextID, exists := envVars["WINDSOR_CONTEXT_ID"]; !exists {
+			t.Error("Expected WINDSOR_CONTEXT_ID to be set even when empty")
+		} else if contextID != "" {
+			t.Errorf("Expected WINDSOR_CONTEXT_ID to be empty, got %q", contextID)
+		}
 	})
 
 	t.Run("ProjectRootError", func(t *testing.T) {
@@ -384,8 +426,8 @@ contexts:
 
 		// And no additional variables should be added
 		t.Logf("Environment variables: %v", envVars)
-		if len(envVars) != 5 {
-			t.Errorf("Should have five base environment variables")
+		if len(envVars) != 6 {
+			t.Errorf("Should have six base environment variables")
 		}
 	})
 
@@ -806,7 +848,7 @@ func TestWindsorEnv_Print(t *testing.T) {
 
 		// And WINDSOR_MANAGED_ENV should include core Windsor variables
 		managedEnv := capturedEnvVars["WINDSOR_MANAGED_ENV"]
-		coreVars := []string{"WINDSOR_CONTEXT", "WINDSOR_PROJECT_ROOT", "WINDSOR_SESSION_TOKEN", "WINDSOR_MANAGED_ENV", "WINDSOR_MANAGED_ALIAS"}
+		coreVars := []string{"WINDSOR_CONTEXT", "WINDSOR_CONTEXT_ID", "WINDSOR_PROJECT_ROOT", "WINDSOR_SESSION_TOKEN", "WINDSOR_MANAGED_ENV", "WINDSOR_MANAGED_ALIAS"}
 		for _, v := range coreVars {
 			if !strings.Contains(managedEnv, v) {
 				t.Errorf("WINDSOR_MANAGED_ENV should contain %q, got %q", v, managedEnv)