stillwater-sc / universal / 23218775201

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Commit Message

feat(blas): add serialization regression tests and verify #509 fix (#589)

Add regression level 1 tests for the serialization facility:

serialization.cpp:
- Exercise ReportFormats for lns and dbns (the lns::fraction() stub
  that caused #509 is now implemented)
- Native float vector save/restore round-trip

typed_serialization.cpp:
- lns<8,2> vector round-trip (directly exercises #509 scenario)
- dbns<8,3> vector round-trip
- integer<32> vector round-trip
- Plus existing float, double, half, type-mismatch, multi-dataset tests

The lns::fraction() function is no longer a stub -- it correctly
extracts the lower rbits as the fractional part of the fixed-point
exponent. This means #509 is resolved.

Resolves #585
Relates to #509

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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51 of 69 new or added lines in 2 files covered. (73.91%)

1 existing line in 1 file now uncovered.

44180 of 52405 relevant lines covered (84.3%)

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