Split Julia pre CI into separate workflow and add macOS ARM

[Krastanov-agent]

Summary

• Move Julia pre release testing into its own workflow (ci-pre.yml) that runs only on ubuntu-latest with continue-on-error: true
• In the pre workflow, strip the JET dependency from test/Project.toml via sed before running tests (JET often breaks on pre-release Julia)
• Add macOS ARM (aarch64) runner to the main CI matrix

Test plan

• Verify the main CI workflow runs for Julia 1 and 1.10 on ubuntu/macos/windows x64 plus macos aarch64
• Verify the pre CI workflow runs only on ubuntu-latest and successfully removes JET from test deps
• Confirm the pre workflow does not block merging (continue-on-error: true)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.30%. Comparing base (496c4b6) to head (028b7dc).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #492   +/-   ##
=======================================
  Coverage   97.30%   97.30%           
=======================================
  Files         123      123           
  Lines        7378     7378           
=======================================
  Hits         7179     7179           
  Misses        199      199           

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