fix: address review feedback — alias default, acronym convention, observability

- #19639: Use empty default for --gitea-url alias to remove ordering dependency
- #19640: Upgrade slog.Warn to slog.Error for missing ReviewSuperseder (signals bug)
- #19641: Remove orphaned comment fragment from buildSupersededBody relocation
- #19642: Rename ProviderGithub → ProviderGitHub per Go acronym convention
- #19643: Log resolution failures at debug level in SupersedeReviews

cmd/review-bot/main.go

@@ -85,8 +85,8 @@ func main() {
 	aicoreResourceGroup := flag.String("aicore-resource-group", envOrDefault("AICORE_RESOURCE_GROUP", "default"), "SAP AI Core resource group (for provider=aicore)")
 
 	// Backward-compatible alias: --gitea-url shares vcsURL's pointer (last flag wins).
-	// Must stay after vcsURL declaration and before flag.Parse().
+	// Shares vcsURL pointer; empty default avoids ordering dependency with vcsURL declaration.
-	flag.StringVar(vcsURL, "gitea-url", *vcsURL, "Deprecated: use --vcs-url instead")
+	flag.StringVar(vcsURL, "gitea-url", "", "Deprecated: use --vcs-url instead")
 
 	flag.Parse()
 
@@ -162,7 +162,7 @@ func main() {
 	case vcs.ProviderGitea:
 		giteaClient := gitea.NewClient(*vcsURL, *reviewerToken)
 		client = gitea.NewAdapter(giteaClient)
-	case vcs.ProviderGithub:
+	case vcs.ProviderGitHub:
 		client = github.NewClient(*reviewerToken, *baseURL)
 	default:
 		panic("unreachable: provider validation should have caught " + vcsProvider.String())
@@ -501,7 +501,7 @@ func main() {
 				os.Exit(1)
 			}
 		} else {
-			slog.Warn("provider does not support review superseding", "provider", vcsProvider)
+			slog.Error("provider does not support review superseding", "provider", vcsProvider)
 		}
 	}
 }
@@ -721,8 +721,6 @@ func validateWorkspacePath(path, pathName string) (string, error) {
 	return resolvedPath, nil
 }
 
-// with collapsed original content and the commit it was evaluated against.
-
 // hasSharedToken detects if another review-bot role posted under the same
 // VCS user. This indicates misconfiguration where two roles share a token
 // instead of having separate accounts. Returns true if shared token

gitea/adapter.go

@@ -282,7 +282,9 @@ func (a *Adapter) SupersedeReviews(ctx context.Context, owner, repo string, prNu
 			if c.ID == 0 {
 				continue
 			}
-			_ = underlying.ResolveComment(ctx, owner, repo, c.ID)
+			if err := underlying.ResolveComment(ctx, owner, repo, c.ID); err != nil {
+				slog.Debug("could not resolve inline comment", "comment_id", c.ID, "error", err)
+			}
 		}
 	}
 	return nil

vcs/provider.go

@@ -7,13 +7,13 @@ type VCSProvider string
 
 const (
 	ProviderGitea  VCSProvider = "gitea"
-	ProviderGithub VCSProvider = "github"
+	ProviderGitHub VCSProvider = "github"
 )
 
 // Valid reports whether p is a known VCS provider.
 func (p VCSProvider) Valid() bool {
 	switch p {
-	case ProviderGitea, ProviderGithub:
+	case ProviderGitea, ProviderGitHub:
 		return true
 	default:
 		return false