[devmotion]

Brings the CI setup in line with JuliaDiff/ChainRulesCore.jl#715.

CI changes

• Dependabot replaces CompatHelper: adds a julia ecosystem entry for /, grouping package updates into one weekly PR. CompatHelper.yml is removed.
• Spell check: new SpellCheck.yml workflow running crate-ci/typos.
• Test matrix: still Linux only. lts and 1 with arch: default, plus the 32-bit x86 job on 1. pre is added and allowed to fail. The separate JuliaNightly.yml workflow is removed.
• IntegrationTest:
  • Adds permissions and julia-actions/cache.
  • Pins julia-buildpkg@v1 instead of @latest and drops the redundant arch: x64.
  • Tests downstream packages in a temporary environment with both packages deved, as in ChainRulesCore.
  • Removes the commented-out ReversePropagation and Diffractor entries.
• format / VersionVigilante:
  • Pin setup-julia@v3 instead of @latest.
  • Fix the VersionVigilante labeller steps, which called github.issues.*. actions/github-script v8 only exposes github.rest.issues.*, so these steps failed silently behind continue-on-error.
• Bumps actions/checkout to v7 and julia-actions/setup-julia to v3 throughout.

Typo fixes

Fixes the 8 misspellings found by typos in comments and the README. There are no functional changes.

Julia nightly

Nightly currently fails in test/rulesets/LinearAlgebra/factorization.jl. The cause is JuliaLang/LinearAlgebra.jl#1717, which landed in Julia 1.15.0-DEV.1 via JuliaLang/julia#63897. Since then, eigen!/eigvals! of a StridedMatrix{<:BlasComplex} always return complex eigenvalues, even for Hermitian input. Our rules don't handle this yet:

• frule(eigen!) and frule(eigvals!) forward Hermitian input to the Hermitian rules and return real values and tangents.
• The rrule(eigen) pullback picks its Hermitian branch with eltype(λ) <: Real, so it now takes the general path, which assumes the geevx phase convention, and computes the wrong ∂A.

Nightly is no longer tested after this PR. This will show up again once Julia 1.15 reaches the pre channel and can be fixed separately.

Repo settings needed

• Add CODECOV_TOKEN as a Dependabot secret (Settings → Secrets and variables → Dependabot). Dependabot PRs can't read normal Actions secrets, and fail_ci_if_error: true would otherwise fail CI on them.
• Update the required status checks:
  • remove JuliaNightly
  • add Spell Check
  • replace the x64 test checks with the new default job names

Testing

• typos passes locally on the whole repo (typos 1.50.3).
• The workflow files parse as valid YAML. actionlint was not run.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.57%. Comparing base (2d84375) to head (de1616f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #850   +/-   ##
=======================================
  Coverage   96.57%   96.57%           
=======================================
  Files          28       28           
  Lines        3618     3618           
=======================================
  Hits         3494     3494           
  Misses        124      124           

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