fix(pipeline): skip RawPages with empty title in BuildPages instead of producing broken paths

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ingestion/internal/api/handler_test.go

@@ -20,9 +20,9 @@ import (
 	"github.com/mathiasbq/hyperguild/ingestion/internal/pipeline"
 )
 
-// stubComplete returns a fixed JSON page so tests never call a real LLM.
+// stubComplete returns a fixed JSON RawPage so tests never call a real LLM.
 func stubComplete(_ context.Context, _, _ string) (string, error) {
-	return `[{"path":"wiki/sources/test-source.md","content":"# Test Source\n\nSome content here.\n"}]`, nil
+	return `[{"title":"Test Source","type":"source","subtype":"article","content":"## Summary\n\nSome content here.\n"}]`, nil
 }
 
 func stubPipelineCfg() pipeline.Config {