/openspec-explore loves to transition to implementation, skipping all the SDD part

I don't know is it me, or intended or bug but when I use `/openspec-explore` (github copilot) we have a nice change about what it learned... and then out of nowhere does this:

```
Good. Now I have all the information I need. Let me write the plan and start implementing.
```

Whoa! Where is the whole proposal, design, apply flow?

Am I using it wrong?

