Apply runic formatting

[kdw503]

Summary

• Format src/RegisterOptimize.jl and test/register_optimize.jl with Runic.jl
• Pure formatting changes only — no functional modifications

Test plan

• CI passes

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 45.37037% with 118 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.22%. Comparing base (e095697) to head (33fe2c3).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/RegisterOptimize.jl	45.37%	118 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   36.25%   36.22%   -0.04%     
==========================================
  Files           1        1              
  Lines         571      577       +6     
==========================================
+ Hits          207      209       +2     
- Misses        364      368       +4     

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