vision — what the product is, and what it refuses to become

Part of super-ux — see system-map.md for the whole pipeline. After writing the document, run python3 docs/ux/lint.py.

The layer above ux-foundation. Foundation answers who uses the product and why; vision answers what the product is and what it refuses to become. Without it, "should we build this?" has no answer that outlives the person who last had an opinion.

Do not confuse it with scenarios.md, the other layer whose name starts with "what": scenarios say what the product does, step by step. A feature can be perfectly scenario'd and still violate the anti-vision.