validate: regenerate aggregated metadata files after deletion

- After deleting failed checksum files, regenerate all aggregated metadata
- Read all.json to ensure current state
- Call AggregateMetadata to regenerate ea.json, ga.json, and hierarchical files
- Regeneration happens in docs/metadata/{release_type}/{os}/{arch}/{image_type}/{jvm_impl}/{vendor}.json

This ensures that:
- all.json is the single source of truth maintained in update command
- Aggregated files (ea.json, ga.json, hierarchical) stay in sync with changes
- After deletions in validate command, aggregation reflects removed entries
- Directory structure always contains consistent, up-to-date metadata

All tests pass.

Co-authored-by: GitHub Copilot <[email protected]>
Co-authored-by: Claude Haiku 4.5 <[email protected]>

Author: 3 people

cmd/java-metadata/main.go

@@ -566,6 +566,13 @@ func runValidate(parentCtx context.Context, metadataDir string, concurrency int,
 			}
 
 			logger.Info(parentCtx, "deletion complete", "checksumsDeleted", deletedChecksumCount, "failed", deleteFailedCount)
+
+			// Regenerate aggregated metadata files after deletions
+			logger.Info(parentCtx, "regenerating aggregated metadata files")
+			if err := regenerateAggregateMetadata(parentCtx, metadataDir, allMetadata); err != nil {
+				logger.Error(parentCtx, "failed to regenerate aggregated metadata", "error", err)
+				// Don't fail validation if aggregation fails - deletions were successful
+			}
 		}
 
 		return fmt.Errorf("%d URLs are not accessible", len(failedEntries))
@@ -574,3 +581,21 @@ func runValidate(parentCtx context.Context, metadataDir string, concurrency int,
 	logger.Info(parentCtx, "all URLs are accessible")
 	return nil
 }
+
+// regenerateAggregateMetadata reads all.json and regenerates aggregated metadata files
+func regenerateAggregateMetadata(ctx context.Context, metadataDir string, allMetadata []models.Metadata) error {
+	// Read all.json to ensure we have the latest state
+	allJsonPath := filepath.Join(metadataDir, "all.json")
+	data, err := os.ReadFile(allJsonPath)
+	if err != nil {
+		return fmt.Errorf("failed to read all.json: %w", err)
+	}
+
+	var currentMetadata models.MetadataList
+	if err := json.Unmarshal(data, &currentMetadata); err != nil {
+		return fmt.Errorf("failed to parse all.json: %w", err)
+	}
+
+	// Regenerate all aggregated files
+	return output.AggregateMetadata(currentMetadata, metadataDir)
+}