Add additional sections.

internal/domain/models/commit.go

@@ -19,6 +19,10 @@ type Commit struct {
 	MeaningfulAdditions int `json:"meaningful_additions"`
 	MeaningfulDeletions int `json:"meaningful_deletions"`
 
+	// Comment line counts
+	CommentAdditions int `json:"comment_additions"`
+	CommentDeletions int `json:"comment_deletions"`
+
 	// Derived fields
 	HasTests bool `json:"has_tests"`
 }

internal/domain/models/metrics.go

@@ -27,6 +27,10 @@ type ContributorMetrics struct {
 	MeaningfulLinesAdded   int `json:"meaningful_lines_added"`
 	MeaningfulLinesDeleted int `json:"meaningful_lines_deleted"`
 
+	// Comment and documentation line counts
+	CommentLinesAdded   int `json:"comment_lines_added"`
+	CommentLinesDeleted int `json:"comment_lines_deleted"`
+
 	// PR metrics
 	PRsOpened      int     `json:"prs_opened"`
 	PRsMerged      int     `json:"prs_merged"`