docs(wiki): Phase 4A/4B 记录 — multi-agent gate 移除 + WASM host 函数

wiki/log.md

@@ -9,6 +9,20 @@ tags: [log, history]
 
 > Append-only 操作记录。格式: `## [日期] 类型 | 描述`
 
+## 2026-04-17 refactor | Phase 4A multi-agent feature gate 移除
+
+- 8 个文件移除 33 处 `#[cfg(feature = "multi-agent")]`
+- zclaw-kernel default features 新增 multi-agent，始终编译
+- A2A router、agents、adapters 代码不再条件编译
+
+## 2026-04-17 feat | Phase 4B WASM host 函数真实实现
+
+- zclaw_log: 读取 guest 内存字符串 + debug! 日志
+- zclaw_http_fetch: ureq v3 同步 GET (10s timeout, network_allowed 守卫)
+- zclaw_file_read: 沙箱 /workspace 读取 + 路径校验防逃逸
+- 新增 ureq v3 workspace 依赖 (wasm feature gated)
+- 25 测试全通过，workspace check 零错误
+
 ## 2026-04-17 refactor | Phase 3A loop_runner 双路径合并
 
 - middleware_chain 从 Option<MiddlewareChain> 改为 MiddlewareChain (Default = 空链)