v1.6.6

Complete Halo Cosmos set — 46 grades (ABT #575).

No code change over 1.6.5. 1.6.5 shipped 42 of the 46 Halo Cosmos NiZn grades; TFH, TBH, SFK and STF were in the same published table and were lost to a digit-requiring regex in the import, not to anything about the source.

It was caught by installing the published 1.6.5 wheel from PyPI and spot-checking grade names against it — i.e. by reading back the shipped artifact rather than re-checking the intermediates, which all agreed with each other because they shared the same bad filter.

grade	mu_i	Bs	Tc
TFH	400	0.450 T	>250 °C
TBH	200	0.410 T	>300 °C
SFK	400	0.460 T	>230 °C
STF	350	0.410 T	>210 °C

MAS da3b723 via MKF 8139ba9c: 707 material records, 46 Halo Cosmos grades.

1.6.5 remains valid and stays on PyPI — the four additions are grades no known part uses, and S4H (the grade that prompted the batch) was already in 1.6.5.