ci: run the nightly jobs on nightly; skip cpu_guard under Miri

[AdaWorldAPI]

Four CI jobs had been red on master since at least 6704865: nightly-simd-polyfill, cargo-careful, docs/nightly and miri. They run only on push / merge_group, so no PR ever showed them. Three of them were never running on nightly at all.

Causes and fixes

job	cause	fix
nightly-simd-polyfill	dtolnay/rust-toolchain@nightly installs nightly, but rust-toolchain.toml pins stable and takes precedence, so plain cargo is stable → E0554: #[feature] may not be used on the stable release channel	cargo +nightly check
cargo-careful	same: on stable, careful fails at rustc --print target-spec-json ("output is invalid JSON")	cargo +nightly careful
docs/nightly	same, and --all-features cannot build at all: intel-mkl/openblas and runtime-dispatch/nightly-simd are mutually exclusive (compile_error!)	cargo +nightly doc --features approx,serde,rayon, the [package.metadata.docs.rs] set
miri	cpu_guard's pre-main hook (from #348) runs cpuid, which is inline assembly, and Miri rejects that, so every test binary aborted at --list	hook is cfg(not(miri)) on all three platforms; the Miri filter skips cpu_guard:: tests

Verified locally (with CI's RUSTFLAGS)

• polyfill: reproduces E0554 on stable; both +nightly feature sets pass.
• The guard still fires on a normal build: a v3 binary under qemu -cpu SandyBridge prints the guard's message instead of hitting SIGILL.
• cpu_guard tests 8/8; clippy -D warnings clean on v3 and avx; fmt clean.
• cargo-careful: the stable failure (target-spec-json "invalid JSON") reproduces locally. The +nightly run and the Miri smoke run: results in a follow-up comment.

The docs job's 126 pre-existing warnings: fixed (a1b8055)

With the build fixed, docs/nightly reached rustdoc for the first time and -Dwarnings reported 127 warnings. This PR fixes all of them. Only /// / //! lines change (122 lines, 43 files); there are no code changes:

• 104 index expressions in prose (a[i], [768], self[k]) were parsed as intra-doc links. Their brackets are now escaped, which renders identically; fenced code blocks are untouched.

• 7 chained formulas or byte layouts (basis_cos[f][j], [name_len:u32][name]…), and 7 bare generics (Vec<u8>, LazyLock<Tier>) that rustdoc read as unclosed HTML tags, now sit in code spans.

• 9 links to private items keep their code formatting but are no longer links.

• Paths corrected:

  • crate::hpc::quantized::int8_gemm_i32;
  • the soa_struct! and blocked_grid_struct! macros;
  • BlockedGrid::{new, new_with_pad, idx};
  • blas_rotg.

  jitson_cranelift (feature jit-native) is no longer a link, and one redundant link target is simplified.

Verified: RUSTDOCFLAGS="-Dwarnings --cfg docsrs" cargo +nightly doc --no-deps --features approx,serde,rayon exits 0. Clippy v3 and fmt are clean.

Note on verification

These four jobs run only on push / merge_group, so this PR's own CI cannot show them; the evidence is the local runs above. They will run for real on the merge to master.

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Reviewing files that changed from the base of the PR and between 9402e57 and 5f60c10.

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📒 Files selected for processing (47)

• .github/workflows/ci.yaml
• scripts/miri-tests.sh
• src/backend/kernels_avx512.rs
• src/backend/native.rs
• src/bitwise.rs
• src/cpu_guard.rs
• src/heel_f64x8.rs
• src/hpc/amx_matmul.rs
• src/hpc/amx_ops.rs
• src/hpc/audio/mdct.rs
• src/hpc/audio/modes.rs
• src/hpc/audio/voice.rs
• src/hpc/bgz17_bridge.rs
• src/hpc/blas_level1.rs
• src/hpc/blocked_grid/base.rs
• src/hpc/blocked_grid/grid_struct_macro.rs
• src/hpc/bnn_causal_trajectory.rs
• src/hpc/clam_compress.rs
• src/hpc/entropy_ladder.rs
• src/hpc/framebuffer.rs
• src/hpc/gguf_indexer.rs
• src/hpc/gpt2/weights.rs
• src/hpc/holo.rs
• src/hpc/jina/runtime.rs
• src/hpc/jitson/mod.rs
• src/hpc/linalg/svd.rs
• src/hpc/merkle_tree.rs
• src/hpc/models/safetensors.rs
• src/hpc/openchat/weights.rs
• src/hpc/renderer.rs
• src/hpc/safetensors.rs
• src/hpc/signature_pde.rs
• src/hpc/soa.rs
• src/hpc/surround_metadata.rs
• src/hpc/vnni_gemm.rs
• src/palette_codec.rs
• src/simd.rs
• src/simd_amx.rs
• src/simd_avx.rs
• src/simd_avx2.rs
• src/simd_avx512.rs
• src/simd_int_ops.rs
• src/simd_masking_ops.rs
• src/simd_neon.rs
• src/simd_nightly/_original_draft.rs
• src/simd_nightly/masks.rs
• src/simd_wasm.rs

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[AdaWorldAPI]

Local results for the two nightly jobs this PR's own CI cannot show (both run only on push / merge_group):

• cargo-careful. On stable it reproduces the CI failure (target-spec-json output is invalid JSON). With cargo +nightly careful test -Zcareful-sanitizer, the 8 cpu_guard tests pass, run with CI's RUSTFLAGS. This was a smoke test on one module, not the full nextest run. The careful nightly toolchain needs the rust-src component: locally, without it, careful stalled for 25 minutes with no compiler running. 5f60c10 makes the job install it with the nightly toolchain, so the fix doesn't rely on careful fetching it. (Corrected: an earlier version of this comment said careful fetches rust-src itself; that was unverified.)
• Miri, on the array-construct test binary, which aborted at --list in CI:
  • fixed tree: 28 passed;
  • disable run with the pre-fix cpu_guard.rs restored: error: unsupported operation: inline assembly is not supported, the exact CI failure. So the cfg(not(miri)) gate is what makes it pass.

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-10T09:42:14.873614Z	5f60c10	Draft marked ready

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