Extend DFTE template engine debug API and refine renderer logging.

Add helpers in DeviceFrameworkTemplateEngineDebug and wire clearer
instrumentation in DeviceFrameworkTemplateRenderer; update README.

include/DeviceFrameworkTemplateEngineDebug.h

@@ -41,6 +41,9 @@ public:
 // Global logger pointer - set by user or defaults to nullptr (disabled)
 extern DeviceFrameworkTemplateEngineLogger* deviceFrameworkTemplateEngineLogger;
 
+/** Opaque owner tag for the active logger (set on enable). Used to disable without clobbering another host. */
+extern const void* deviceFrameworkTemplateEngineLoggerOwner;
+
 // ============================================================================
 // LOGGING MACROS - NO-OPS BY DEFAULT
 // ============================================================================
@@ -86,6 +89,13 @@ extern DeviceFrameworkTemplateEngineLogger* deviceFrameworkTemplateEngineLogger;
     } \
 } while(0)
 
+/** Optional verbose trace (compile with -DDFTE_ENABLE_TRACE). Maps to debug() on the active logger. */
+#if defined(DFTE_ENABLE_TRACE)
+#define DFTE_LOG_TRACE(msg) DFTE_LOG_DEBUG(String(F("[TRACE] ")) + String(msg))
+#else
+#define DFTE_LOG_TRACE(msg) do { (void)0; } while(0)
+#endif
+
 // ============================================================================
 // LOGGING CONFIGURATION FUNCTIONS
 // ============================================================================
@@ -98,12 +108,21 @@ extern DeviceFrameworkTemplateEngineLogger* deviceFrameworkTemplateEngineLogger;
  */
 bool deviceFrameworkTemplateEngineEnableLogging(DeviceFrameworkTemplateEngineLogger* logger);
 
+/**
+ * Enable logging and record an owner tag (e.g. `this` of WiFiManagerServer).
+ * If ownerTag is nullptr, the logger pointer is used as the tag.
+ */
+bool deviceFrameworkTemplateEngineEnableLogging(DeviceFrameworkTemplateEngineLogger* logger, const void* ownerTag);
+
 /**
  * Disable all logging
  * Sets logger to nullptr, making all DFTE_LOG_* macros no-ops
  */
 void deviceFrameworkTemplateEngineDisableLogging();
 
+/** Disable only if the current logger was registered with this owner tag. Returns true if disabled. */
+bool deviceFrameworkTemplateEngineDisableLoggingForOwner(const void* ownerTag);
+
 /**
  * Check if logging is currently enabled
  * 
@@ -118,4 +137,6 @@ bool deviceFrameworkTemplateEngineIsLoggingEnabled();
  */
 DeviceFrameworkTemplateEngineLogger* deviceFrameworkTemplateEngineGetLogger();
 
+const void* deviceFrameworkTemplateEngineGetLoggerOwner();
+
 #endif // DEVICEFRAMEWORK_TEMPLATE_ENGINE_DEBUG_H