Aware trigger title simplification

[suxinshuo]

Pre-checks

• I have searched existing issues and this is not a duplicate.

What problem does this solve?

In previous versions, the trigger title was derived from focus.md and was shorter. Now it's derived from the description, which is too long and difficult to read, just like the content in the details.

Proposed solution

Add a "summary" field to the agent_focus_items table.

Willing to contribute?

• I'd be interested in working on this.