The previous byte-position test packed with the test's own packer on
both sides of the comparison, so it exercised none of the library code.
It now pins hand-computed byte values (43/100/127/42/124...) at the
region boundaries (79/80, 119/120) as ground truth and drives both
directions through the library: to_float must place each literal byte's
trit at the exact element, and from_float must produce the exact literal
byte, for both planes.
Also probes ggml_validate_row_data over all 256 byte values in qs and
qh positions (must accept exactly the 243/81 reachable codes), the
all-0xaa block, and a well-formed packed block.
test-dt3 checks the layout against an independent packer written from
the format spec: single-trit position mapping for all 256 (plane, pos)
pairs, structural byte-position checks at the region boundaries
(79/80, 119/120), exact round-trips with negative scales, byte parity
of the in-tree quantizer on already-ternary inputs, and the vec_dot
against a hand-made sum over the known trits (catches any path that
reads the padding 5th trit of the qh bytes).
test-dt3-rust-parity.py packs known trits with ternaria's pack_dt3 and
verifies that dequantize_row_dt3 (via test-dt3 --dequant) reproduces
d1*t1 + d2*t2 bit-exactly.
Also wires DT3 into the test-quantize-fns thresholds (ternary class).
Millaguie