Unify application configuration loading

internal/app/config_loader_test.go

@@ -0,0 +1,50 @@
+package app
+
+import (
+	"context"
+	"os"
+	"strings"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/narratio/internal/config"
+)
+
+func TestLoadCommandConfigRetainsInitiallyLoadedPipeline(t *testing.T) {
+	workspaceRoot := t.TempDir()
+	pipelinePath, campaignPath, sessionPath := writeValidConfigFiles(t, workspaceRoot)
+
+	originalLoader := loadPipelineConfigFn
+	loadCalls := 0
+	loadPipelineConfigFn = func(path string) (*config.PipelineConfig, error) {
+		loaded, err := originalLoader(path)
+		if err != nil {
+			return nil, err
+		}
+		loadCalls++
+
+		data, err := os.ReadFile(path)
+		if err != nil {
+			return nil, err
+		}
+		changedRoot := workspaceRoot + "-changed"
+		updated := strings.ReplaceAll(string(data), workspaceRoot, changedRoot)
+		if err := os.WriteFile(path, []byte(updated), 0o644); err != nil {
+			return nil, err
+		}
+		return loaded, nil
+	}
+	t.Cleanup(func() { loadPipelineConfigFn = originalLoader })
+
+	loaded, err := loadCommandConfig(context.Background(), pipelinePath, "", campaignPath, sessionPath, config.SessionLoadOptions{SessionID: "2026-05-03"})
+	if err != nil {
+		t.Fatalf("loadCommandConfig() error = %v", err)
+	}
+	defer func() { _ = loaded.Close() }()
+
+	if loadCalls != 1 {
+		t.Fatalf("pipeline load calls = %d, want 1", loadCalls)
+	}
+	if got := loaded.Config.Pipeline.Workspace.Root; got != workspaceRoot {
+		t.Fatalf("resolved workspace root = %q, want originally loaded %q", got, workspaceRoot)
+	}
+}