The validator (validator.jsonfeed.org) flagged home_url as an unknown property: the spec's field is home_page_url in both 1.0 and 1.1 — home_url does not exist. Since the feed is new (no subscribers to break), target the current spec version 1.1 properly:
- home_url -> home_page_url
- version -> https://jsonfeed.org/version/1.1
- deprecated singular author -> authors array
All emitted keys are defined 1.1 keys; tests, docs and the showcase feed updated.