Fix CI failures: pyarrow guards, DSL API contract drift, UQ reducer keying#1349

Merged

SkBlaz merged 3 commits into

copilot/find-coverage-gapsfrom

copilot/sub-pr-1347-again

Apr 15, 2026

Commits on Apr 15, 2026

Initial plan
Copilot
authored
Fix CI failures: pyarrow guards, reducer keying, NoNoise identity tests, get_layers helper

Copilot
and
SkBlaz
authored
Tighten from_layers() list validation: reject non-string elements with clear ValueError

Copilot
and
SkBlaz
authored