NCA fictional catalogue fixture v1. Extract and serve fixture/: python3 -m http.server 8769 --bind 127.0.0.1 --directory fixture
Open localhost:8769. Buttons select authored themes. They do not emulate Safari Adaptive Dark Mode. Required Safari beta not tested. Blank worksheet has 18 planned rows. Actual observations are 12 Chrome rows; six authored contrast calculations use ordinary-text 4.5 reference only. Missing zoom/system-appearance measurements remain explicit. Screenshots are real Chrome captures. Original code MIT, fictional data CC0. No external dependencies or data submission in the fixture.
