Add new QA test for Devin's code explanation capabilities

[staging-devin-ai-integration]

Add new QA test for Devin's code explanation capabilities

This PR adds a new QA test to verify Devin's ability to explain code concepts and provide implementations. The test:

1. Asks Devin to explain the binary search algorithm and provide a Python implementation
2. Verifies that Devin's explanation includes the time complexity (O(log n))
3. Checks that Devin provides a Python implementation
4. Tests Devin's ability to explain edge cases for the algorithm

The test follows the existing pattern in the QA_TESTS list and includes appropriate CHECK statements to verify expected behavior.

Link to Devin run: https://staging.itsdev.in/sessions/83a9d469832c49ecb6764a3081252407
Requested by: salimaghadimi+newflow1@gmail.com

[staging-devin-ai-integration]

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