feat(pierre): sanity check

cmd/pierre/main.go

@@ -46,6 +46,12 @@ type ReviewConfig struct {
 }
 
 type Config struct {
+	// Deprecated flags (no prefix). Retained for backward compatibility.
+	// These will be mapped to the embedded ReviewConfig if provided.
+	MaxChunkSize    int      `help:"Deprecated: use --review-max-chunk-size"`
+	Guidelines      []string `help:"Deprecated: use --review-guidelines" sep:","`
+	DisableComments bool     `help:"Deprecated: use --review-disable-comments"`
+
 	// Embedding ReviewConfig with a prefix changes flag names to `--review-…`.
 	// Existing configuration files using the old flag names will need to be updated.
 	// Consider keeping backwards compatibility if required.
@@ -75,6 +81,17 @@ func main() {
 		kong.Configuration(kongyaml.Loader, "config.yaml", defaultConfig),
 	)
 
+	// Backwards compatibility: map deprecated flag values (if any) to the embedded ReviewConfig.
+	if cfg.MaxChunkSize != 0 {
+		cfg.Review.MaxChunkSize = cfg.MaxChunkSize
+	}
+	if len(cfg.Guidelines) > 0 {
+		cfg.Review.Guidelines = cfg.Guidelines
+	}
+	if cfg.DisableComments {
+		cfg.Review.DisableComments = cfg.DisableComments
+	}
+
 	// Auto-detect provider
 	provider := cfg.GitProvider
 	if provider == "" {