feat: Add insertion and deletion counts to shortstat parsing

Parses the insertion and deletion counts from the shortstat string output. This information is now available for further processing or display. A TODO comment is added to explore optimizing the regex for parsing.

auto-commit-msg{Version:0.4.0-dev Model:gemini-2.5-flash-lite ResponseTime:1.641004209s ExecutionTime:1.648603458s}

Author: sestrella

cmd/root.go

@@ -85,6 +85,7 @@ var rootCmd = &cobra.Command{
 		}
 		shortStatStr := string(shortStat)
 
+		// TODO: Get insertions and deletions using a single regex, take into account num of files?
 		insertionMatches := regexp.MustCompile(`(\d+)\s+insertions?\(\+\)`).FindStringSubmatch(shortStatStr)
 		insertions := 0
 		if len(insertionMatches) > 1 {