tapgarden+universe: improve logging/error messages for uni proof insert

Enhanced clarity and detail in log and error messages during the
insertion of proofs into the universe. This aids in debugging and
provides better feedback during failures or unexpected states.

Author: ffranr

tapgarden/caretaker.go

@@ -1311,7 +1311,7 @@ func (b *BatchCaretaker) batchStreamUniverseItems(ctx context.Context,
 			err := uni.UpsertProofLeafBatch(ctx, batch)
 			if err != nil {
 				return fmt.Errorf("unable to register "+
-					"issuance batch: %w", err)
+					"proof leaf batch: %w", err)
 			}
 
 			log.Infof("Inserted %d new leaves (%d of %d) into "+

universe/archive.go

@@ -428,8 +428,8 @@ func extractBatchDeps(batch []*Item) map[UniverseKey]*asset.Asset {
 func (a *Archive) UpsertProofLeafBatch(ctx context.Context,
 	items []*Item) error {
 
-	log.Infof("Verifying %d new proofs for insertion into Universe",
-		len(items))
+	log.InfoS(ctx, "Verifying new proofs for insertion into Universe",
+		"count", len(items))
 
 	// Issuance proofs that also create an asset group (a.k.a. group
 	// anchors) must be verified and stored before any issuance proofs that
@@ -529,25 +529,25 @@ func (a *Archive) UpsertProofLeafBatch(ctx context.Context,
 		return err
 	}
 
-	log.Infof("Inserting %d verified group anchor proofs into Universe",
-		len(anchorItems))
+	log.InfoS(ctx, "Inserting verified group anchor proofs into Universe",
+		"count", len(anchorItems))
 	err = a.cfg.Multiverse.UpsertProofLeafBatch(ctx, anchorItems)
 	if err != nil {
-		return fmt.Errorf("unable to register new group anchor "+
-			"issuance proofs: %w", err)
+		return fmt.Errorf("upsert group anchor proof leaf batch "+
+			"(count=%d): %w", len(anchorItems), err)
 	}
 
 	err = verifyBatch(nonAnchorItems)
 	if err != nil {
 		return err
 	}
 
-	log.Infof("Inserting %d verified proofs into Universe",
-		len(nonAnchorItems))
+	log.InfoS(ctx, "Inserting verified proofs into Universe",
+		"count", len(nonAnchorItems))
 	err = a.cfg.Multiverse.UpsertProofLeafBatch(ctx, nonAnchorItems)
 	if err != nil {
-		return fmt.Errorf("unable to register new issuance proofs: %w",
-			err)
+		return fmt.Errorf("upsert proof leaf batch (count=%d): %w",
+			len(nonAnchorItems), err)
 	}
 
 	// Log a sync event for the newly inserted leaf in the background as an