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#2575.1

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Vendor a regression test pinning `_divide_note` barren (#802)

* Add `testDivideNoteBarren` regression guard for the list-concat false positive

Vendor MusicTransformer's `midi_processor/processor.py` (no TensorFlow) as a
single-file fixture and assert `_divide_note` performs no tensor computation.
Ariadne 0.52.35 typed its `result_array += [on, off]` list concatenation as a
tensor of TensorFlow origin (wala/ML#750), enabled by the `SplitNote` list being
mis-typed as a tensor (wala/ML#752); 0.52.36 stops typing loop-carried list
concatenation as a tensor, so the function is barren again. The assertion fails
if a future release reintroduces the mis-typing.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K8tXuyy3YWhM7BzvmCxKAn

* Assert `_divide_note` barren with `assertFalse`, matching `testCoraDataPrepBarren`

`_divide_note` has no primitive-parameter path, so `getHasTensorComputation()`
is a definite `FALSE` (barren), confirmed at 0.52.36. `assertNotEquals(TRUE, ...)`
would also pass on a `null`, masking a regression; `assertFalse` asserts the
actual barren verdict, matching the sibling barren pin.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K8tXuyy3YWhM7BzvmCxKAn

* Revert to null-tolerant `assertNotEquals(TRUE)` for `_divide_note`

`assertFalse` NPEs when `getHasTensorComputation()` returns null, which happens
for `_divide_note` under the full suite via the #799 tc-null transient (CI caught
it: NPE at testDivideNoteBarren). The guard is against the verdict becoming TRUE
(the wala/ML#750 false positive); tolerating null is correct.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K8tXuyy3YWhM7BzvmCxKAn

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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Source Files on job #2575.1