fix(samples): correct return type annotation for _validate_shopping_agent

[meetrick]

Description

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Summary

Fix incorrect return type annotation in MerchantAgentExecutor._validate_shopping_agent().

Problem

The method was annotated with -> None but actually returns bool:

• Returns True when the shopping agent is authorized (line 134)
• Returns False when validation fails (lines 122, 129)
• The caller checks the return value: if not await self._validate_shopping_agent(...) (line 88)

Solution

Change the return type annotation from -> None to -> bool.

[gemini-code-assist]

Summary of Changes

Hello @meetrick, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a type annotation discrepancy within the MerchantAgentExecutor class. It updates the _validate_shopping_agent method's return type from None to bool, aligning the type hint with the method's actual behavior of returning a boolean value. This enhancement improves code readability and static analysis capabilities without introducing any functional changes.

Highlights

• Return Type Annotation Correction: The _validate_shopping_agent method in MerchantAgentExecutor had an incorrect -> None return type annotation. This pull request corrects it to -> bool to accurately reflect that the method returns boolean values.

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[gemini-code-assist]

Code Review

This pull request correctly updates the return type annotation for the _validate_shopping_agent method from -> None to -> bool. This change aligns the type hint with the function's implementation, which returns boolean values to indicate validation success or failure. The fix is accurate and improves code clarity and the reliability of static analysis tools.