fix(example): correct ParsedTaskGoal usage and add unrelated memory for testing

[Wujiaxuan007]

fix(example): correct ParsedTaskGoal usage and add unrelated memory for testing

Description

This PR fixes the initialization of ParsedTaskGoal in the example to use the correct fields, and adds both relevant and unrelated memory items to ranked_memories for better demonstration and testing.
No logic changes to the core modules.
No new dependencies.

Fixes # (no related issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change
• Refactor
• Documentation update

How Has This Been Tested?

• Manual test: Ran the example script to ensure it works as expected and unrelated memory is handled properly.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Maintainer Checklist

• closes #xxxx
• Made sure Checks passed

[Ki-Seki]

I’ve suggested @CaralHsi to review your PR, but please change the target branch first. We are actively working on the dev branch, not main. Click the edit button to change the target branch.

[CaralHsi]

Approved.
Thank you so much for your contribution to the memos community!
Your work is greatly appreciated.