Fix benchmark workflow configuration

[Krastanov-agent]

Summary

• Replace the pair of benchmark workflow files with the single correct benchmark.yml
• Use AirspeedVelocity.jl action v1 for consolidated benchmarking
• Properly handle both pull requests and main branch benchmarking

Changes

• Removed: benchmark.yml and benchmark-comment.yml (old split configuration)
• Added: Single benchmark.yml using MilesCranmer/AirspeedVelocity.jl@action-v1

Benefits

• Simpler workflow configuration
• Consistent with other packages in the ecosystem (e.g., PBCCompiler.jl)
• Uses the latest AirspeedVelocity.jl action

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.63%. Comparing base (7870bef) to head (f2740ce).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #154   +/-   ##
=======================================
  Coverage   94.63%   94.63%           
=======================================
  Files          12       12           
  Lines         317      317           
=======================================
  Hits          300      300           
  Misses         17       17           

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