fix: address review feedback — gofmt NITs and remove unreachable default

- github/client.go: add missing blank line between doRequestWithBody and doJSONRequest
- cmd/review-bot/main.go: remove double blank line before findAllOwnReviews
- cmd/review-bot/main.go: remove unreachable default case in VCS client init switch
  (provider is already validated at startup)
- cmd/review-bot/main_test.go: remove double blank line before TestHasSharedToken
- cmd/review-bot/main_test.go: fix comment alignment (gofmt)
- review/persona_test.go: fix comment alignment in table literal (gofmt)

cmd/review-bot/main.go

@@ -179,9 +179,6 @@ func main() {
 			ghBaseURL = "https://api.github.com"
 		}
 		client = github.NewClient(*reviewerToken, ghBaseURL)
-	default:
-		fmt.Fprintf(os.Stderr, "Error: unhandled provider %q\n", *provider)
-		os.Exit(1)
 	}
 	slog.Info("VCS client initialized", "provider", *provider)
 
@@ -899,7 +896,6 @@ func extractSentinelName(body string) string {
 	return name
 }
 
-
 // findAllOwnReviews returns all non-superseded reviews matching the sentinel.
 func findAllOwnReviews(reviews []vcs.Review, sentinel string) []vcs.Review {
 	var result []vcs.Review

cmd/review-bot/main_test.go

@@ -210,7 +210,6 @@ func TestBuildSupersededBodyShortSHA(t *testing.T) {
 	}
 }
 
-
 func TestHasSharedToken(t *testing.T) {
 	tests := []struct {
 		name     string
@@ -646,8 +645,8 @@ func TestExtractSentinelName_EdgeCases(t *testing.T) {
 		{"<!-- review-bot:sonnet --> rest", "sonnet"},
 		{"<!-- review-bot:gpt-review --> rest", "gpt-review"},
 		{"no sentinel here", "unknown"},
-		{"<!-- review-bot:", "unknown"},                   // prefix but no suffix
-		{"prefix <!-- review-bot:abc --> end", "abc"},     // embedded in text
+		{"<!-- review-bot:", "unknown"},               // prefix but no suffix
+		{"prefix <!-- review-bot:abc --> end", "abc"}, // embedded in text
 	}
 
 	for _, tc := range tests {