feat(agent): 运行时内部错误上报到日志(onReport)

- PiAgentRuntimeOptions.onReport:本次运行扩展的系统提示 section、能力工具、beforeTool / beforeRequest 钩子抛错
  先上报(runId + 位置 + 脱敏信息)再原样抛出;pi-durable 的 Harness onReport 也接进来(source=harness)
- server runner / 视觉子流程用 runtimeReporter 写 warn 日志
- 测试:钩子抛错时上报带 runId 与位置、信息已脱敏,调用照常被 block

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

packages/agent/src/index.ts

@@ -36,6 +36,7 @@ export {
   DEFAULT_COMPACTION_INSTRUCTIONS,
   PiAgentRuntime,
   type PiAgentRuntimeOptions,
+  type RuntimeReport,
   toolContent,
 } from "./pi/runtime.ts";
 export { LegacySessionError, sessionPathFor } from "./pi/session.ts";