Drop KERNEL_PROJECT_ID fallback

Projects is a brand new feature — KERNEL_PROJECT_ID was never in
production, so there's no legacy to preserve. Only read KERNEL_PROJECT.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: masnwilliams

cmd/root.go

@@ -105,17 +105,14 @@ func resolveProjectSelection(projectFlag string) string {
 	if projectFlag != "" {
 		return projectFlag
 	}
-	if projectEnv := os.Getenv("KERNEL_PROJECT"); projectEnv != "" {
-		return projectEnv
-	}
-	return os.Getenv("KERNEL_PROJECT_ID")
+	return os.Getenv("KERNEL_PROJECT")
 }
 
 func init() {
 	rootCmd.PersistentFlags().BoolP("version", "v", false, "Print the CLI version")
 	rootCmd.PersistentFlags().BoolP("no-color", "", false, "Disable color output")
 	rootCmd.PersistentFlags().String("log-level", "warn", "Set the log level (trace, debug, info, warn, error, fatal, print)")
-	rootCmd.PersistentFlags().String("project", "", "Project ID to scope all requests to (or set KERNEL_PROJECT or KERNEL_PROJECT_ID env var)")
+	rootCmd.PersistentFlags().String("project", "", "Project ID or name to scope all requests to (or set KERNEL_PROJECT env var)")
 	rootCmd.SilenceUsage = true
 	rootCmd.SilenceErrors = true
 	cobra.OnInitialize(initConfig)

cmd/root_test.go

@@ -79,27 +79,18 @@ func TestIsAuthExempt(t *testing.T) {
 }
 
 func TestResolveProjectSelection(t *testing.T) {
-	t.Run("flag value wins over env vars", func(t *testing.T) {
+	t.Run("flag value wins over env var", func(t *testing.T) {
 		t.Setenv("KERNEL_PROJECT", "env-project")
-		t.Setenv("KERNEL_PROJECT_ID", "env-project-id")
 		assert.Equal(t, "flag-project", resolveProjectSelection("flag-project"))
 	})
 
-	t.Run("new env var wins over legacy env var", func(t *testing.T) {
+	t.Run("env var used when no flag", func(t *testing.T) {
 		t.Setenv("KERNEL_PROJECT", "env-project")
-		t.Setenv("KERNEL_PROJECT_ID", "env-project-id")
 		assert.Equal(t, "env-project", resolveProjectSelection(""))
 	})
 
-	t.Run("legacy env var used as fallback", func(t *testing.T) {
-		t.Setenv("KERNEL_PROJECT", "")
-		t.Setenv("KERNEL_PROJECT_ID", "env-project-id")
-		assert.Equal(t, "env-project-id", resolveProjectSelection(""))
-	})
-
 	t.Run("empty when no flag or env var", func(t *testing.T) {
 		t.Setenv("KERNEL_PROJECT", "")
-		t.Setenv("KERNEL_PROJECT_ID", "")
 		assert.Equal(t, "", resolveProjectSelection(""))
 	})
 }