docs: update implementation log with tools registration

- Add tools registration section in session.rs
- Add update log table with all commits

IMPLEMENTATION_LOG.md

@@ -297,6 +297,46 @@ fn exclusive(&self) -> bool { false }          // 是否独占
 ```bash
 cargo test --lib                    # 所有测试
 cargo test --lib tools::schema      # SchemaCleanr
+```
+
+## 工具注册
+
+工具在 `src/gateway/session.rs` 的 `default_tools()` 函数中注册：
+
+```rust
+fn default_tools() -> ToolRegistry {
+    let mut registry = ToolRegistry::new();
+    registry.register(CalculatorTool::new());
+    registry.register(FileReadTool::new());
+    registry.register(FileWriteTool::new());
+    registry.register(FileEditTool::new());
+    registry.register(BashTool::new());
+    registry.register(HttpRequestTool::new(
+        vec!["*".to_string()], // 允许所有域名
+        1_000_000,             // max_response_size
+        30,                    // timeout_secs
+        false,                 // allow_private_hosts
+    ));
+    registry.register(WebFetchTool::new(50_000, 30));
+    registry
+}
+```
+
+SessionManager 使用这些工具创建 AgentLoop 实例，所有工具自动对 LLM 可用。
+
+## 更新日志
+
+| 日期 | Commit | 变更 |
+|------|--------|------|
+| 2026-04-07 | `d5b6cd2` | feat: add SchemaCleanr |
+| 2026-04-07 | `a9e7aab` | feat: add file_read tool |
+| 2026-04-07 | `16b052b` | feat: add file_write tool |
+| 2026-04-07 | `f3187ce` | feat: add file_edit tool |
+| 2026-04-07 | `68e3663` | feat: add bash tool |
+| 2026-04-07 | `1581732` | feat: add http_request tool |
+| 2026-04-07 | `8936e70` | feat: add web_fetch tool |
+| 2026-04-07 | `b13bb8c` | docs: add implementation log |
+| 2026-04-08 | `98bc973` | feat: register all tools in SessionManager |
 cargo test --lib tools::file_read   # file_read
 cargo test --lib tools::file_write  # file_write
 cargo test --lib tools::file_edit   # file_edit