Bump diskann-quantization to edition 2024.

[Mark Hildebrand (hildebrandmw)]

Bump diskann-quantization to Rust edition 2024 - addressing instances of the warn-by-default unsafe-op-in-unsafe-fn lint.

The automatically generated flatbuffers code is explicitly excluded from the new lint.

Note that edition 2024 changes rustfmt - so there are significant changes to formatting as well.

[Copilot]

Pull request overview

Updates diskann-quantization to Rust edition 2024 and addresses the new warn-by-default unsafe-op-in-unsafe-fn lint by making unsafe operations explicit and suppressing the lint for generated FlatBuffers code.

Changes:

• Bump diskann-quantization crate to Rust edition 2024.
• Wrap unsafe operations inside unsafe fn bodies with explicit unsafe { ... } blocks and add/adjust safety justifications.
• Suppress unsafe_op_in_unsafe_fn warnings for included/generated FlatBuffers modules.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
diskann-quantization/Cargo.toml	Sets crate edition to Rust 2024.
diskann-quantization/src/test_util.rs	Adds explicit unsafe block for allocator deallocation forwarding.
diskann-quantization/src/multi_vector/matrix.rs	Adds explicit unsafe blocks and safety comments for pointer arithmetic and slice creation.
diskann-quantization/src/minmax/multi/meta.rs	Adds explicit unsafe block for Box::from_raw deallocation.
diskann-quantization/src/flatbuffers.rs	Suppresses unsafe_op_in_unsafe_fn for generated FlatBuffers modules.
diskann-quantization/src/bits/slice.rs	Adds explicit unsafe block when calling unsafe internal constructor.
diskann-quantization/src/alloc/mod.rs	Adds explicit unsafe block for delegating deallocation.
diskann-quantization/src/alloc/aligned.rs	Adds explicit unsafe block + justification for deallocation with adjusted layout.
diskann-quantization/src/algorithms/kmeans/common.rs	Adds explicit unsafe block around pointer .add(...).
diskann-quantization/src/algorithms/heap.rs	Adds explicit unsafe block for unchecked slice access.

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[Codecov Comments Bot (codecov-commenter)]

Codecov Report

❌ Patch coverage is 94.92386% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.99%. Comparing base (e093583) to head (4d8154e).
⚠️ Report is 35 commits behind head on main.

Files with missing lines	Patch %	Lines
diskann-quantization/src/algorithms/heap.rs	14.28%	6 Missing ⚠️
diskann-quantization/src/minmax/quantizer.rs	20.00%	4 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #772 +/- ##
=======================================
Coverage 88.99% 88.99% =======================================
Files 428 428 Lines 78415 78401 -14 =======================================
- Hits 69784 69772 -12 + Misses 8631 8629 -2 

Flag	Coverage Δ
miri	88.99% <94.92%> (+<0.01%)	⬆️
unittests	88.99% <94.92%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
diskann-quantization/src/algorithms/hadamard.rs	97.94% <ø> (ø)
...skann-quantization/src/algorithms/kmeans/common.rs	97.45% <100.00%> (ø)
...skann-quantization/src/algorithms/kmeans/lloyds.rs	98.10% <ø> (ø)
...ann-quantization/src/algorithms/kmeans/plusplus.rs	97.27% <ø> (ø)
...ation/src/algorithms/transforms/double_hadamard.rs	76.92% <100.00%> (-0.24%)	⬇️
...ann-quantization/src/algorithms/transforms/null.rs	100.00% <ø> (ø)
...tion/src/algorithms/transforms/padding_hadamard.rs	84.34% <100.00%> (-0.14%)	⬇️
...antization/src/algorithms/transforms/test_utils.rs	87.89% <ø> (ø)
...nn-quantization/src/algorithms/transforms/utils.rs	90.24% <ø> (ø)
diskann-quantization/src/alloc/aligned.rs	97.82% <100.00%> (ø)
... and 31 more

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