ConceptLens: turning a useful explanation into a reading note

ConceptLens is a product experiment around reading. It starts with a small question: when I encounter an unfamiliar concept, how can I get an explanation and find it again later?

The current Obsidian plugin lets me select text, view an overview, explanation or translation, and save it as a concept note. The code is in a public repository; the browser and Mac versions remain local prototypes.

What I want to examine next is the note's usefulness. Does the explanation fit the passage I am reading? Can I find it later, and does it still help?