YATIFY DATA QUALITY / UAT LAB

This evidence pack contains real validation results run against portfolio
datasets rather than a decorative list of QA principles.

Current validation run:
- tests: 22
- pass: 21
- warnings: 1
- failures: 0
- analytical areas: 3

WARN does not mean a test was ignored. It means the observation is permitted
but must remain visible, such as a known historical source gap that must not be
converted to zero.

Publication rule:
High-severity FAIL -> do not promote the dataset.
WARN -> publish only when the limitation is documented and does not invalidate
the decision being supported.
