fix(security): resolve js-yaml advisory and clear-text env logging

[rsaz]

Pin transitive js-yaml to 4.2.0 via npm overrides (dev toolchain only). Replace debug dump of the full env object with key names only.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.59%. Comparing base (a6a9d22) to head (248c231).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #244      +/-   ##
==========================================
+ Coverage   86.48%   86.59%   +0.10%     
==========================================
  Files           6        6              
  Lines         259      261       +2     
  Branches       59       60       +1     
==========================================
+ Hits          224      226       +2     
  Misses         33       33              
  Partials        2        2              

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