chore: capture post-P0/P1 state for clean P2 start (working tree was dirty at task begin)

cmd/root.go

@@ -108,7 +108,16 @@ var rootCmd = &cobra.Command{
 			finalMaxRequestsPerClient = maxRequestsPerClient
 		}
 
-		sc := steamcache.New(
+		// Validate after loading and applying CLI overrides (fail fast, do not create default on validate error)
+		if err := cfg.Validate(); err != nil {
+			logger.Logger.Error().
+				Err(err).
+				Msg("Configuration validation failed")
+			fmt.Fprintf(os.Stderr, "Error: Invalid configuration: %v. Please fix the config file and try again.\n", err)
+			os.Exit(1)
+		}
+
+		sc, err := steamcache.New(
 			cfg.ListenAddress,
 			cfg.Cache.Memory.Size,
 			cfg.Cache.Disk.Size,
@@ -118,7 +127,16 @@ var rootCmd = &cobra.Command{
 			cfg.Cache.Disk.GCAlgorithm,
 			finalMaxConcurrentRequests,
 			finalMaxRequestsPerClient,
+			cfg.MaxObjectSize,
+			cfg.TrustedProxies,
 		)
+		if err != nil {
+			logger.Logger.Error().
+				Err(err).
+				Msg("Failed to initialize steamcache")
+			fmt.Fprintf(os.Stderr, "Error: Failed to initialize steamcache: %v. Check sizes in config.\n", err)
+			os.Exit(1)
+		}
 
 		logger.Logger.Info().
 			Msg("steamcache2 " + version.Version + " started on " + cfg.ListenAddress)