docs(openclaw-plugin): drop agent_end from README hook list per #1866 (#1871)

#1866 explicitly removed the agent_end hook from index.ts because OpenClaw 5.2 blocks that typed hook for non-bundled plugins without conversation access; session routing is now recorded through session_start/session_end. README.md and README_CN.md still listed agent_end in the hook-layer summary.

Author: r266-tech

examples/openclaw-plugin/README.md

@@ -19,7 +19,7 @@ This document is not an installation guide. It is an implementation-focused desi
 In the current implementation, the plugin plays four roles at once:
 
 - `context-engine`: implements `assemble`, `afterTurn`, and `compact`
-- hook layer: handles `session_start`, `session_end`, `agent_end`, and `before_reset`
+- hook layer: handles `session_start`, `session_end`, and `before_reset`
 - tool provider: registers memory/archive tools plus OpenViking resource and skill import tools
 - runtime manager: connects to and monitors a remote OpenViking service
 

examples/openclaw-plugin/README_CN.md

@@ -19,7 +19,7 @@
 按当前代码职责看，插件同时扮演四个角色：
 
 - `context-engine`：实现 `assemble`、`afterTurn`、`compact`
-- Hook 层：接管 `session_start`、`session_end`、`agent_end`、`before_reset`
+- Hook 层：接管 `session_start`、`session_end`、`before_reset`
 - Tool 提供者：注册 memory/archive 工具，以及 OpenViking resource 和 skill 导入工具
 - 运行时管理器：连接并监控远程 OpenViking 服务