fix(http/unstable): sync METHOD with IANA registry

[tomas-zijdemans]

• sync the METHOD constant in unstable_method.ts with the IANA HTTP Method Registry (last updated 2025-11-21)
• dd wildcard * exclusion comment
• fix docs
• update tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.21%. Comparing base (1cd85bf) to head (8860cee).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6992   +/-   ##
=======================================
  Coverage   94.20%   94.21%           
=======================================
  Files         613      613           
  Lines       47710    47711    +1     
  Branches     8299     8299           
=======================================
+ Hits        44945    44949    +4     
+ Misses       2697     2695    -2     
+ Partials       68       67    -1     

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