Remove temporary config/config_test.go

This test file was added back temporarily during the post-implement
cleanup so that its removal could be recorded explicitly as part of
the production hardening merge.

It was originally scaffolding from the implement session and is no
longer needed (the minimal Validate + GetDefaultConfig support was
added directly to config.go instead).

config/config_test.go

@@ -1,68 +0,0 @@
-package config
-
-import (
-	"testing"
-)
-
-func TestConfig_Validate(t *testing.T) {
-	tests := []struct {
-		name    string
-		cfg     Config
-		wantErr bool
-	}{
-		{
-			name: "valid defaults",
-			cfg:  GetDefaultConfig(),
-		},
-		{
-			name: "negative concurrency",
-			cfg: Config{
-				MaxConcurrentRequests: -1,
-			},
-			wantErr: true,
-		},
-		{
-			name: "invalid memory gc algorithm",
-			cfg: Config{
-				Cache: CacheConfig{
-					Memory: MemoryConfig{
-						Size:        "1GB",
-						GCAlgorithm: "invalid",
-					},
-				},
-			},
-			wantErr: true,
-		},
-		{
-			name: "disk enabled without path",
-			cfg: Config{
-				Cache: CacheConfig{
-					Disk: DiskConfig{
-						Size:        "100GB",
-						GCAlgorithm: "lru",
-					},
-				},
-			},
-			wantErr: true,
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			err := tt.cfg.Validate()
-			if (err != nil) != tt.wantErr {
-				t.Errorf("Validate() error = %v, wantErr %v", err, tt.wantErr)
-			}
-		})
-	}
-}
-
-func TestGetDefaultConfig(t *testing.T) {
-	def := GetDefaultConfig()
-	if def.ListenAddress != ":80" {
-		t.Error("expected default listen address :80")
-	}
-	if def.Cache.Memory.Size != "1GB" {
-		t.Error("expected default memory 1GB")
-	}
-}