docs-screenshot

Take, frame and file a documentation screenshot, then put it in front of the user on a contact sheet and ask for a verdict. TRIGGER when: the user asks to take, re-shoot, recapture, replace or border a screenshot in a project's docs; a capture script under docs/screenshots/capture/ is about to run or be written; a user-supplied image is being filed into the docs; any turn changes an image file and has to report it; or screenshot-relevance permits a capture. DO NOT TRIGGER when: the question is only whether the existing screenshots are stale or missing — that is `screenshot-relevance`, which hands its captures here.