Remove dormant forecast comparison policy

internal/config/load.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
 	"os"
@@ -62,7 +63,9 @@ func mergeFile(cfg *Config, path string) error {
 	if err := rejectRetiredExecutionConfig(data); err != nil {
 		return fmt.Errorf("parse config %q: %w", path, err)
 	}
-	if err := yaml.Unmarshal(data, cfg); err != nil {
+	decoder := yaml.NewDecoder(bytes.NewReader(data))
+	decoder.KnownFields(true)
+	if err := decoder.Decode(cfg); err != nil {
 		return fmt.Errorf("parse config %q: %w", path, err)
 	}
 	if cfg.MissingSource.Sources == nil {