claude: fold in old sow-tools

internal/pipeline/chunk_validation.go

@@ -0,0 +1,27 @@
+package pipeline
+
+import (
+	"fmt"
+
+	"git.westgate.pw/ShadowsOverWestgate/sow-tools/internal/erf"
+)
+
+func ensureUniqueChunkResources(chunk hakChunk) error {
+	seen := map[string]string{}
+	for _, asset := range chunk.Assets {
+		key := fmt.Sprintf("%s:%04x", asset.Resource.Name, asset.Resource.Type)
+		if previous, exists := seen[key]; exists {
+			return fmt.Errorf("resource %s from %s conflicts with %s inside generated hak %s", chunkResourceLabel(asset), asset.Rel, previous, chunk.Name)
+		}
+		seen[key] = asset.Rel
+	}
+	return nil
+}
+
+func chunkResourceLabel(asset assetResource) string {
+	extension, ok := erf.ExtensionForResourceType(asset.Resource.Type)
+	if !ok {
+		return asset.Resource.Name
+	}
+	return asset.Resource.Name + "." + extension
+}