BREAKING(http/unstable): split parseProblemDetails, validate status, add statusText option

[tomas-zijdemans]

• Split parseProblemDetails into sync (unknown input) and async parseProblemDetailsResponse.
• Add statusText option to ProblemDetailsResponseOptions, forwarded to Response only when defined.
• Throw RangeError for non-integer status in createProblemDetailsResponse.
• Rewrite ProblemDetailsExtensions JSDoc to honestly describe the intersection-based safety.
• Tighten isProblemDetailsResponse docs; add @throws tags throughout.
• Add runnable Response parse example; replace Record<never, never> defaults with Record<string, never>.
• Backfill tests for status validation, statusText forwarding, and primitive bodies.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.61%. Comparing base (a496da2) to head (3e22841).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7117   +/-   ##
=======================================
  Coverage   94.61%   94.61%           
=======================================
  Files         634      634           
  Lines       51801    51815   +14     
  Branches     9329     9336    +7     
=======================================
+ Hits        49011    49025   +14     
  Misses       2216     2216           
  Partials      574      574           

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