feat: add CI/CD status integration to wt status

[timvw]

Summary

• Add --ci flag to wt status to show CI/CD pipeline status per branch
• Uses gh CLI for GitHub repos (commit status API + check runs API)
• Uses glab CLI for GitLab repos (pipeline status)
• Color-coded indicators: ✓ pass (green), ✗ fail (red), ● pending (yellow)
• Opt-in flag to avoid network latency on default status command
• Included in JSON output as ci field when present
• Unit tests for all normalization functions and formatting

Test plan

• wt status works as before (no CI column without --ci)
• wt status --ci shows CI status for branches with pipelines
• wt status --ci --format json includes ci field in JSON output
• Gracefully handles missing gh/glab CLI (no error, no CI column)
• Gracefully handles branches without CI pipelines

[codecov]

Codecov Report

❌ Patch coverage is 43.85965% with 64 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.16%. Comparing base (cf2a562) to head (b9ac9ad).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
status.go	43.36%	63 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
+ Coverage   28.53%   29.16%   +0.62%     
==========================================
  Files          26       26              
  Lines        2600     2712     +112     
==========================================
+ Hits          742      791      +49     
- Misses       1780     1841      +61     
- Partials       78       80       +2     

Files with missing lines	Coverage Δ
main.go	70.11% <100.00%> (+0.34%)	⬆️
status.go	46.03% <43.36%> (-4.51%)	⬇️

... and 1 file with indirect coverage changes

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