fix: move default wazero cache outside mcp-logs artifact path

internal/cmd/flags_logging.go

@@ -23,7 +23,7 @@ func init() {
 	RegisterFlag(func(cmd *cobra.Command) {
 		cmd.Flags().StringVar(&logDir, "log-dir", envutil.GetEnvString("MCP_GATEWAY_LOG_DIR", config.DefaultLogDir), "Directory for log files (falls back to stdout if directory cannot be created)")
 		cmd.Flags().StringVar(&payloadDir, "payload-dir", envutil.GetEnvString("MCP_GATEWAY_PAYLOAD_DIR", config.DefaultPayloadDir), "Directory for storing large payload files (segmented by session ID)")
-		cmd.Flags().StringVar(&wasmCacheDir, "wasm-cache-dir", resolveWasmCacheDir(false, "", envutil.GetEnvString("MCP_GATEWAY_LOG_DIR", config.DefaultLogDir)), "Directory for disk-backed wazero compilation cache (default: <log-dir>/wazero-cache)")
+		cmd.Flags().StringVar(&wasmCacheDir, "wasm-cache-dir", resolveWasmCacheDir(false, "", envutil.GetEnvString("MCP_GATEWAY_LOG_DIR", config.DefaultLogDir)), "Directory for disk-backed wazero compilation cache (default: sibling of <log-dir>, named wazero-cache)")
 		cmd.Flags().StringVar(&payloadPathPrefix, "payload-path-prefix", envutil.GetEnvString("MCP_GATEWAY_PAYLOAD_PATH_PREFIX", ""), "Path prefix to use when returning payloadPath to clients (allows remapping host paths to client/agent container paths)")
 		cmd.Flags().IntVar(&payloadSizeThreshold, "payload-size-threshold", envutil.GetEnvInt("MCP_GATEWAY_PAYLOAD_SIZE_THRESHOLD", config.DefaultPayloadSizeThreshold), "Size threshold (in bytes) for storing payloads to disk. Payloads larger than this are stored, smaller ones returned inline")
 	})

internal/cmd/flags_logging_test.go

@@ -12,7 +12,7 @@ import (
 )
 
 func TestDefaultWasmCacheDir(t *testing.T) {
-	assert.Equal(t, "/tmp/logs/"+config.DefaultWasmCacheDirName, defaultWasmCacheDir("/tmp/logs"))
+	assert.Equal(t, "/tmp/"+config.DefaultWasmCacheDirName, defaultWasmCacheDir("/tmp/logs"))
 }
 
 func TestDefaultWasmCacheDir_EmptyLogDir(t *testing.T) {
@@ -23,7 +23,7 @@ func TestDefaultWasmCacheDir_EmptyLogDir(t *testing.T) {
 }
 
 func TestResolveWasmCacheDir(t *testing.T) {
-	t.Run("defaults beneath log dir when no override is set", func(t *testing.T) {
+	t.Run("defaults next to log dir when no override is set", func(t *testing.T) {
 		t.Setenv(wasmCacheDirEnvVar, "")
 		assert.Equal(t, defaultWasmCacheDir("/tmp/logs"), resolveWasmCacheDir(false, "", "/tmp/logs"))
 	})

internal/cmd/proxy.go

@@ -128,7 +128,7 @@ Local usage:
 	cmd.Flags().StringVar(&proxyToken, "github-token", "", "Fallback GitHub API token (default: forwards client Authorization header)")
 	cmd.Flags().StringVarP(&proxyListen, "listen", "l", "127.0.0.1:8080", "Proxy listen address")
 	cmd.Flags().StringVar(&proxyLogDir, "log-dir", defaultProxyLogDir, "Log file directory")
-	cmd.Flags().StringVar(&proxyWasmCacheDir, "wasm-cache-dir", resolveWasmCacheDir(false, "", defaultProxyLogDir), "Directory for disk-backed wazero compilation cache (default: <log-dir>/wazero-cache)")
+	cmd.Flags().StringVar(&proxyWasmCacheDir, "wasm-cache-dir", resolveWasmCacheDir(false, "", defaultProxyLogDir), "Directory for disk-backed wazero compilation cache (default: sibling of <log-dir>, named wazero-cache)")
 	cmd.Flags().StringVar(&proxyDIFCMode, "guards-mode", "filter", "DIFC enforcement mode: strict, filter, propagate")
 	cmd.Flags().StringVar(&proxyAPIURL, "github-api-url", "", "Upstream GitHub API URL (default: auto-derived from GITHUB_API_URL or GITHUB_SERVER_URL, falls back to https://api.github.com)")
 	cmd.Flags().BoolVar(&proxyTLS, "tls", false, "Enable HTTPS with auto-generated self-signed certificates")

internal/cmd/proxy_test.go

@@ -339,7 +339,7 @@ func TestNewProxyCmd_LogDirDefault(t *testing.T) {
 		"--log-dir should default to config.DefaultLogDir when MCP_GATEWAY_LOG_DIR is unset")
 }
 
-// TestNewProxyCmd_WasmCacheDirDefault verifies --wasm-cache-dir defaults beneath --log-dir.
+// TestNewProxyCmd_WasmCacheDirDefault verifies --wasm-cache-dir defaults next to --log-dir.
 func TestNewProxyCmd_WasmCacheDirDefault(t *testing.T) {
 	t.Setenv("MCP_GATEWAY_LOG_DIR", "")
 	t.Setenv(wasmCacheDirEnvVar, "")
@@ -350,7 +350,7 @@ func TestNewProxyCmd_WasmCacheDirDefault(t *testing.T) {
 	val, err := cmd.Flags().GetString("wasm-cache-dir")
 	require.NoError(t, err)
 	assert.Equal(t, defaultWasmCacheDir(config.DefaultLogDir), val,
-		"--wasm-cache-dir should default beneath config.DefaultLogDir when env vars are unset")
+		"--wasm-cache-dir should default adjacent to config.DefaultLogDir when env vars are unset")
 }
 
 // TestNewProxyCmd_ListenFlag verifies --listen, -l shorthand and default value.

internal/cmd/wasm_cache.go

@@ -13,7 +13,10 @@ import (
 )
 
 func defaultWasmCacheDir(logDir string) string {
-	return filepath.Join(logDir, config.DefaultWasmCacheDirName)
+	if logDir == "" {
+		return config.DefaultWasmCacheDirName
+	}
+	return filepath.Join(filepath.Dir(logDir), config.DefaultWasmCacheDirName)
 }
 
 func resolveWasmCacheDir(flagChanged bool, flagValue, effectiveLogDir string) string {