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🧪 [Testing Improvement] Add negative values test for Engine.greedyNextToken#64

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🧪 [Testing Improvement] Add negative values test for Engine.greedyNextToken#64
void0x14 wants to merge 1 commit intomainfrom
jules/test-greedy-next-token-negative-logits-9676428443616097337

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🎯 What: Adds a test case for Engine.greedyNextToken to verify correctness when dealing with entirely negative logits array values. The slice is specifically initialized with @memset to override std.testing.allocator's default 0xaa (which amounts to -3.03e-13 in f32) to properly simulate negative probability boundaries.
📊 Coverage: Specifically covers the Engine.greedyNextToken function within echo-core-zig/src/inference/engine.zig, increasing robustness and guarding against regressions.
Result: Improved test coverage that directly exercises boundary scenarios for model sequence token selection during decoding steps.


PR created automatically by Jules for task 9676428443616097337 started by @ulac000000

This commit introduces a test in `echo-core-zig/src/inference/engine.zig`
to explicitly verify that `Engine.greedyNextToken` accurately identifies
the maximum logit even when all values in the array are negative. This
fixes a gap in test coverage and ensures boundary cases are handled.

Co-authored-by: ulac000000 <132948319+ulac000000@users.noreply.github.com>
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