tighten edge-case handling for reductions and shape ops#356
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* All named reductions (sum, prod, max, min, any, all and derivatives like mean, var, sd) reject reducing over a zero-size axis at trace time. `prim_reduce` (user-supplied init) remains exempt. * `prim_argmax` / `prim_argmin` reject reducing over a zero-size axis; `nv_argmax` / `nv_argmin` reject 0-dimensional operands. * `nv_diag` requires a 1-D operand. * `nv_var` / `nv_sd` default `dims = NULL` (reduce all axes), matching the other reductions. * `nv_squeeze` rejects duplicate dims via `assert_integerish(unique)`. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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prim_reduce(user-supplied init) remains exempt.prim_argmax/prim_argminreject reducing over a zero-size axis;nv_argmax/nv_argminreject 0-dimensional operands.nv_diagrequires a 1-D operand.nv_var/nv_sddefaultdims = NULL(reduce all axes), matching the other reductions.nv_squeezerejects duplicate dims viaassert_integerish(unique).