chore: isolate formatting cleanup from #60

[shamaton]

Summary

This PR extracts formatting-only changes from #60 so the functional fix in #60 is easier to review.

Background / Motivation

#60 includes an actual decoder fix, but it also contains unrelated formatting changes across Go files, README, and workflow YAML. Splitting those changes out reduces diff noise and keeps #60 focused on the behavior change.

Changes

• Apply Go formatting cleanup across existing source and test files
• Normalize README formatting
• Normalize GitHub workflow YAML formatting

Test Plan

• go test ./...

Notes

This PR is intended to be behavior-neutral. It does not include the decoder fix from #60.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.36%. Comparing base (20ba54b) to head (4689d60).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #61   +/-   ##
=======================================
  Coverage   98.36%   98.36%           
=======================================
  Files          72       72           
  Lines        6038     6039    +1     
=======================================
+ Hits         5939     5940    +1     
  Misses         70       70           
  Partials       29       29           

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