[rluders]

Closes #19

• ProblemDetails.Extensions tag json:"extensions,omitempty" → json:"-", with a comment explaining that MarshalJSON/UnmarshalJSON flatten members to the top level.
• Test asserting no nested extensions key is emitted.

No wire-format change.

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Reviewing files that changed from the base of the PR and between 84bb764 and 382412c.

📒 Files selected for processing: 2

• problem_details.go
• problem_details_test.go

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.27%. Comparing base (84bb764) to head (382412c).
⚠️ Report is 1 commits behind head on main.
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   86.27%   86.27%           
=======================================
  Files          14       14           
  Lines         583      583           
=======================================
  Hits          503      503           
  Misses         62       62           
  Partials       18       18           

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