Rust 1.98.1 → 1.99.0; drop deprecated std::f64 module import

[AdaWorldAPI]

This moves ndarray to Rust 1.99.0 as part of the workspace-wide sweep (lance-graph #1437, merged).

What changes

• Toolchain pins (rust-toolchain.toml, rust-version, CI, Dockerfile / Dockerfile.avx512) go from 1.98.1 to 1.99.0. Comments that mention 1.98.1 are left alone.
• tests/numeric.rs: 1.99 fully deprecates the legacy float module constants such as std::f64::NAN. The file had use std::f64;, so f64::NAN resolved to that deprecated constant. Removing the import makes all 4 uses resolve to the associated constant f64::NAN.

How it was verified (rustc 1.99.0)

Check	Result
codegen witness, AVX-512 (--config .cargo/config-v4.toml)	PASS: vpternlog present, 6 in probe_mask_ternlog_slice
codegen witness, AVX2 (config-v3)	PASS: packed vector logic only, no GPR logic on lane data
simd-masking-parity on v4 (avx512f=true)	14 check groups bit-identical to their references
lgj-abi AllTests (612 checks) and the consumer suites, built on ndarray::simd with 1.99	pass

The codegen and parity rows show LLVM 23 changed nothing measurable in the SIMD lowering.

I also compared the error set of clippy --workspace --all-targets --keep-going -D warnings on 1.98.1 and 1.99.0. The only error 1.99 adds is the deprecated-NAN one fixed here. The remaining errors exist on 1.98.1 as well, so this bump doesn't touch them:

• missing_safety_doc in blas-tests / blas-mock-tests
• a cesium lib-test that never fails
• "Missing backend: could not compile"

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📒 Files selected for processing (9)

• .github/workflows/ci.yaml
• Cargo.toml
• Dockerfile
• Dockerfile.avx512
• crates/encryption/Cargo.toml
• crates/fractal/Cargo.toml
• crates/p64/Cargo.toml
• rust-toolchain.toml
• tests/numeric.rs

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-10T06:33:42.440278Z	952a0c7	Draft marked ready

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