Port revert of "Add FFT causal conv1d frontend bindings" (#437) to feat/frost_develop

[Anerudhan]

Summary

Ports the revert of #437 ("Add FFT causal conv1d frontend bindings") from develop over to feat/frost_develop.

#437 was reverted on develop by #479 (merged as 05533fc5). feat/frost_develop branched from develop at b5a068d4 (the #437 merge commit), so it still carries the FFT causal conv1d code. This PR cherry-picks 05533fc5 onto it so the two branches agree.

The cherry-pick is -x recorded and applied with no conflicts — the only commit on feat/frost_develop not on develop is "Add GDN cuTile and FROST engines" (bbf3aa4a), which touches none of the files #437 changed.

Verification

• git diff 05533fc5 HEAD is byte-identical to git diff b5a068d4 bbf3aa4a — i.e. after this revert, the only delta between feat/frost_develop and reverted develop is exactly the GDN cuTile/FROST engine work, unchanged.
• Every file touched by Add FFT causal conv1d frontend bindings #437 is byte-identical to its state at 74785165, the commit immediately preceding Add FFT causal conv1d frontend bindings #437.
• No FROST/GDN files are modified by this PR.

Note: the --stat for this cherry-pick reads +106 / -1669 rather than #479's +14 / -1577. That is purely git's rewrite detection re-rendering test/python/test_causal_conv1d.py as a whole-file rewrite; the applied content is identical, as the two checks above confirm.

Affected area

• Python API or bindings
• C++ samples and documentation

Related

• Reverts the effect of Add FFT causal conv1d frontend bindings #437 on this branch
• Ports Revert "Add FFT causal conv1d frontend bindings (#437)" #479

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