[Bug]: "Implement the recommendation" does not pass the Opinions recommendation to Codex

### Platform

macOS

### Operating system version

macOS Tahoe 26.3

### System architecture

ARM64 (M1, M2, etc)

### PolyScope Version

0.11.0

### Bug description

After running Opinions and then typing "Implement the recommendation", the resulting agent does not receive the actual recommendation / synthesis from the Opinions run in its context.

Because of that, the agent starts without the key information it is supposed to implement and does not know what recommendation to act on.

This looks like a context handoff bug between the Opinions feature and the follow-up implementation flow.

### Steps to reproduce

1. Open a workspace.
2. Run Opinions with two or more models.
3. Wait for the synthesis / recommendation to appear.
4. Type "Implement the recommendation" into the chat.

### Relevant log output

```shell

```

No source files or tests are identified in the issue. Reproduce the flow by running Opinions with at least two models, waiting for its synthesis, and entering “Implement the recommendation”; then trace the Opinions-to-agent context handoff and verify that the resulting agent receives the recommendation text.

由索引模型根据 Issue 内容生成。