Fix gofmt formatting and push code coverage to 80%

[0x524a]

Summary

• Fix gofmt formatting in 6 files (goreportcard gofmt score was 72.73%)
• Push code coverage from 74.5% to 80.0% with targeted tests

Coverage by package

Package	Before	After
collector	94.4%	96.0%
config	97.5%	97.5%
plugin	91.5%	92.3%
orchestrator	87.8%	87.8%
server	85.2%	88.9%
shipper	74.7%	85.1%
Total	74.5%	80.0%

Test plan

• go test -race ./... — all pass
• gofmt -l cmd/ internal/ — no unformatted files
• go vet ./... — clean

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.82%. Comparing base (4b42d1e) to head (2f553ba).
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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   72.53%   77.82%   +5.28%     
==========================================
  Files          18       18              
  Lines        1664     1664              
==========================================
+ Hits         1207     1295      +88     
+ Misses        386      305      -81     
+ Partials       71       64       -7     

Flag	Coverage Δ
unittests	77.82% <ø> (+5.28%)	⬆️

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