feat: add block tensor literal syntax for %op PPX extension
Implement block tensor construction via list, tuple, and array syntax
in %op blocks: [x1; x2] (output axis), (x1, x2) (input axis),
[|x1; x2|] (batch axis). Disambiguate from ndarray constants by
checking the first leaf expression.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
446069
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Apr 22 22:19 +00:00