docs(agent): fix stale ledger-guard comment and translate ActionNode javadoc

- ProgressLedgerService.upsert: the reserved-prefix guard rejects the write; the
  comment said 'strip the prefix and continue', which no longer matches. Rewrite
  it to describe the actual reject behavior.
- ActionNode: translate the class javadoc (including the B2 pinned-constraints and
  B5 auto-backfill notes) to English per code style.

mateclaw-server/src/main/java/vip/mate/agent/graph/node/ActionNode.java

@@ -19,19 +19,24 @@ import java.util.concurrent.CancellationException;
 import static vip.mate.agent.graph.state.MateClawStateKeys.*;
 
 /**
- * 工具执行节点（ReAct Action 阶段）
+ * Tool-execution node (the ReAct Action phase).
  * <p>
- * 委托 {@link ToolExecutionExecutor} 执行工具调用，支持并发执行和审批 barrier。
+ * Delegates tool-call execution to {@link ToolExecutionExecutor}, supporting
+ * concurrent execution and the approval barrier.
  * <p>
- * 支持 forced_replay 阶段：当审批通过后的重放调用到达时，跳过 ToolGuard 检查直接执行。
+ * Supports the forced_replay phase: when an approved replay call arrives, it
+ * skips the ToolGuard check and executes directly.
  *
- * <p>B2: 当检测到 {@code load_skill} 调用时，从 skill manifest 提取
- * {@code constraints} 并写入 ProgressLedger 的 pinned entries，使约束
- * 在整个对话中可见、不被 LLM 的 progress_update 覆盖、不被上下文压缩裁剪。
+ * <p>B2: when a {@code load_skill} call is detected, the skill manifest's
+ * {@code constraints} are extracted and written to the ProgressLedger's pinned
+ * entries, so the constraints stay visible for the whole conversation — never
+ * overwritten by the LLM's progress_update, never trimmed by context compression.
  *
- * <p>B5: 工具调用成功后自动回填 ProgressLedger，让 LLM 即使不主动调用
- * progress_update 也能在下一轮看到已完成的工具调用记录。自动记录条数有上限
- * （{@link ProgressLedgerService#MAX_AUTO_RECORDED}），且不覆盖 LLM 已写的条目。
+ * <p>B5: after a tool call succeeds, the ProgressLedger is auto-backfilled so the
+ * LLM sees the completed tool-call record on the next turn even without calling
+ * progress_update. Auto-recorded entries are capped
+ * ({@link ProgressLedgerService#MAX_AUTO_RECORDED}) and never overwrite entries
+ * the LLM already wrote.
  *
  * @author MateClaw Team
  */

mateclaw-server/src/main/java/vip/mate/agent/progress/ProgressLedgerService.java

@@ -127,8 +127,8 @@ public class ProgressLedgerService {
         }
         // Guard reserved prefixes — the LLM must not overwrite Java-managed
         // entries (auto-recorded tool calls or pinned skill constraints).
-        // Strip the prefix and continue with the remainder so the LLM's
-        // progress_update still lands, just under a non-reserved key.
+        // Reject the write so the caller re-issues progress_update under a
+        // non-reserved key instead of clobbering a system-managed entry.
         if (key.startsWith(ProgressLedger.AUTO_RECORDED_PREFIX) || key.startsWith("pin_")) {
             throw new IllegalArgumentException(
                     "step key prefix '" + ProgressLedger.AUTO_RECORDED_PREFIX