Only run during business hours by default

It's best to only trigger failures when there are people around to fix them. Llama should only interfere with the environment during business hours (specifically Mon-Fri, 9:30am to 3pm - to allow for the morning coffee and to avoid being the reason someone would have to stay behind to fix a failure)

Start by locating the AWS Lambda entry point and the code that triggers failures. Define the business-hours window as Monday through Friday, 9:30am to 3pm, and verify that failures are not triggered outside it. The payload names no specific files or tests, so inspect the repository structure first.

Written by the indexing model from the issue text.