Feature: deliver completed Orca Worker results to an active Goal Mode lead

**提交人**: Yop
**客户端版本**: 0.1.46

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## Use case

I use Goal Mode to let Cindy carry a multi-step task through without manually managing the agent lifecycle. Some steps delegate work to an Orca Worker, and the lead agent needs that worker's result before it can continue.

## Current behavior

This reproduces consistently:

1. Start a task in Goal Mode.
2. Delegate a dependency to an Orca Worker.
3. The lead agent continues running while its next step depends on the worker's result.
4. The worker's result is not injected into the still-running lead agent.
5. I can manually stop the lead agent, after which the Orca Worker result is delivered/injected.

This creates a deadlock in practice: the lead cannot correctly advance without the worker's answer, but I must stop the lead to make that answer available. Manually stopping the agent defeats the purpose of Goal Mode.

## Expected behavior

When an Orca Worker completes, Cindy should automatically steer its result to the active lead agent, including while that lead is running in Goal Mode. The lead should then be able to use the result and continue the current goal without requiring the user to stop or manually manage the agent.

## Requested scope

Please reconsider the completion-delivery mechanism for Orca Workers, especially its interaction with Goal Mode and dependency-driven task flows. At minimum, completed worker results should have a reliable path to an active lead; ideally this should be automatic and preserve the ongoing Goal Mode workflow.

## Frequency and workaround

- Frequency: consistently reproducible.
- Current workaround: manually stop the lead agent so the worker result is injected.
- Why that is insufficient: Goal Mode is specifically intended to avoid manual agent/process management.

No logs, screenshots, or diagnostic attachments are included in this report.
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**版本区域**: CN
**OS**: win32 x64 (10.0.26200)
**界面语言**: zh-CN

No files, tests, or entry points are named. Reproduce the Goal Mode workflow with an Orca Worker dependency, then trace worker completion delivery and the active lead's handling while it is running. Done means the completed result reaches the active lead automatically and the goal continues without manually stopping the lead.

Written by the indexing model from the issue text.