fix: address review feedback on PR #106

- Replace interface{} with any in github/reviews.go (Go 1.18+ idiom)
- Add default panic case to VCS client init switch
- Refactor supersedeOldReviews to return error instead of os.Exit(1)
- Remove spurious blank lines in formatter.go and formatter_test.go
- Add doc comment to DeleteReview explaining when to use vs DismissReview
- Sanitize extractSentinelName output to prevent log injection

cmd/review-bot/main.go

@@ -169,6 +169,8 @@ func main() {
 			ghBaseURL = "https://api.github.com"
 		}
 		client = github.NewClient(*reviewerToken, ghBaseURL)
+	default:
+		panic("unreachable: unhandled provider " + *provider)
 	}
 	slog.Info("VCS client initialized", "provider", *provider)
 
@@ -498,7 +500,10 @@ func main() {
 
 	// Supersede all old reviews
 	if len(oldReviews) > 0 {
-		supersedeOldReviews(ctx, client, *provider, *vcsURL, owner, repoName, prNumber, oldReviews, posted.ID, sentinel)
+		if err := supersedeOldReviews(ctx, client, *provider, *vcsURL, owner, repoName, prNumber, oldReviews, posted.ID, sentinel); err != nil {
+			slog.Error("failed to supersede old reviews", "error", err)
+			os.Exit(1)
+		}
 	}
 }
 
@@ -517,7 +522,7 @@ func verdictToEvent(verdict string) vcs.ReviewEvent {
 // supersedeOldReviews marks old reviews as superseded.
 // For GitHub: dismisses old reviews.
 // For Gitea: edits the review body and resolves inline comments.
-func supersedeOldReviews(ctx context.Context, client vcs.Client, provider, vcsURL, owner, repoName string, prNumber int, oldReviews []vcs.Review, newReviewID int64, sentinel string) {
+func supersedeOldReviews(ctx context.Context, client vcs.Client, provider, vcsURL, owner, repoName string, prNumber int, oldReviews []vcs.Review, newReviewID int64, sentinel string) error {
 	if provider == "github" {
 		for _, old := range oldReviews {
 			if err := client.DismissReview(ctx, owner, repoName, prNumber, old.ID, "Superseded by new review"); err != nil {
@@ -526,14 +531,13 @@ func supersedeOldReviews(ctx context.Context, client vcs.Client, provider, vcsUR
 				slog.Info("dismissed old review", "review_id", old.ID, "new_review_id", newReviewID, "pr", prNumber)
 			}
 		}
-		return
+		return nil
 	}
 
 	// Gitea: existing EditComment + ResolveComment flow
 	giteaAdapter, ok := client.(*gitea.Adapter)
 	if !ok {
-		slog.Error("expected gitea.Adapter for gitea provider")
-		os.Exit(1)
+		return fmt.Errorf("expected gitea.Adapter for gitea provider, got %T", client)
 	}
 	underlying := giteaAdapter.Underlying()
 
@@ -576,6 +580,7 @@ func supersedeOldReviews(ctx context.Context, client vcs.Client, provider, vcsUR
 			slog.Warn("some inline comments could not be resolved", "review_id", oldReview.ID, "failed", failed, "pr", prNumber)
 		}
 	}
+	return nil
 }
 
 // fetchFileContext fetches the full content of modified files from the PR branch.
@@ -847,7 +852,21 @@ func extractSentinelName(body string) string {
 	if end < 0 {
 		return "unknown"
 	}
-	return rest[:end]
+	name := rest[:end]
+	// Sanitize: strip control characters to prevent log injection.
+	name = strings.Map(func(r rune) rune {
+		if r < 0x20 || r == 0x7f {
+			return -1
+		}
+		return r
+	}, name)
+	if len(name) > 64 {
+		name = name[:64]
+	}
+	if name == "" {
+		return "unknown"
+	}
+	return name
 }
 
 // findOwnReview locates the most recent non-superseded review matching the sentinel.