fix: 仅按 Token 阈值压缩上下文

- EasyFlow 调用方忽略新旧消息数压缩配置

- 保留最小 Token 阈值与最近消息保留数量

- 隐藏智能体配置页的消息数阈值

easyflow-modules/easyflow-module-agent/src/main/java/tech/easyflow/agent/runtime/AgentRuntimeCompiler.java

@@ -54,6 +54,11 @@ public class AgentRuntimeCompiler {
 
     private static final Logger LOG = LoggerFactory.getLogger(AgentRuntimeCompiler.class);
     private static final int LOG_TEXT_MAX_LENGTH = 500;
+
+    /**
+     * EasyFlow 仅按 Token 阈值触发压缩，消息数阈值固定为不可达上限。
+     */
+    private static final int DISABLED_MESSAGE_COMPRESSION_THRESHOLD = Integer.MAX_VALUE;
     private static final Pattern MCP_INPUT_PATTERN = Pattern.compile("\\$\\{input:([A-Za-z0-9_.-]+)}");
 
     @Resource
@@ -147,6 +152,14 @@ public class AgentRuntimeCompiler {
         return options;
     }
 
+    /**
+     * 编译 Agent 记忆策略。
+     *
+     * <p>EasyFlow 侧统一关闭按消息数触发压缩，已保存的旧消息阈值配置不会进入运行时。</p>
+     *
+     * @param config 记忆配置
+     * @return 运行时记忆策略
+     */
     private AgentMemoryPolicy buildMemoryPolicy(Map<String, Object> config) {
         AgentMemoryPolicy policy = new AgentMemoryPolicy();
         policy.setType(memoryTypeValue(config, "type"));
@@ -159,17 +172,7 @@ public class AgentRuntimeCompiler {
         if (enabled != null) {
             parameter.setEnabled(enabled);
         }
-        Integer msgThreshold = intValue(compressionConfig, "msgThreshold");
-        if (msgThreshold == null) {
-            msgThreshold = intValue(config, "maxAttachedMessageCount");
-        }
-        if (msgThreshold == null) {
-            msgThreshold = intValue(config, "historyLimit");
-        }
-        if (msgThreshold != null) {
-            parameter.setMsgThreshold(msgThreshold);
-            policy.setMaxAttachedMessageCount(msgThreshold);
-        }
+        parameter.setMsgThreshold(DISABLED_MESSAGE_COMPRESSION_THRESHOLD);
         Integer lastKeep = intValue(compressionConfig, "lastKeep");
         if (lastKeep != null) {
             parameter.setLastKeep(lastKeep);