fix: address review feedback on PR #106

- Add 429 rate-limit retry logic to doJSONRequest (matching doRequest
  behavior) so write operations (PostReview, DismissReview) properly
  retry when rate-limited by GitHub
- Remove redundant explicit case for ReviewEventComment in
  translateReviewEvent (default already handles it)
- Add ordering comment on --gitea-url alias registration explaining
  the dependency on registration-before-parse evaluation order
- Add tests for doJSONRequest retry/exhaust behavior

cmd/review-bot/main.go

@@ -91,6 +91,10 @@ func main() {
 	// NOTE: If a user passes both --vcs-url and --gitea-url, the last one on
 	// the command line takes effect (standard flag package behavior). This is
 	// acceptable since --gitea-url is deprecated and both serve the same purpose.
+	//
+	// ORDERING: This must remain AFTER vcsURL's flag.String declaration and BEFORE
+	// flag.Parse(). The *vcsURL dereference captures the env-var-resolved default
+	// at registration time; moving flag.Parse() above this line would break it.
 	flag.StringVar(vcsURL, "gitea-url", *vcsURL, "Deprecated: use --vcs-url instead")
 
 	flag.Parse()