when fact-checking with h, provide option to create and publicize a claimreview

_Summary_

I am a scientist working with Climate Feedback. I’ve learned that Google is adding a fact-check label to some stories, based on schema.org’s ClaimReview. Great! But, the whole point of ClimateFeedback is that our fact-checking is independent of what publishers do. How can we leverage this kind of emerging standard in the annotation layer that overlays their content?

_Detailed discussion_

Please see https://docs.google.com/document/d/1Hmb_gfBVVLCQ1yI4l-rTtS2579x8Ug7J6FA0M4onrQU/edit#heading=h.1z9qs4jfzdeb

Start with the linked Google Doc and the issue's description of the annotation layer; no repository files or tests are identified. Before implementation, define the concrete change and acceptance criteria for creating and publicizing a ClaimReview.

Written by the indexing model from the issue text.