[colinmoy]

Prioritize MLKEM1024 (keeping X25519MLKEM768 as fallback) in CURLOPT_SSL_EC_CURVES when GOOGLE_CLOUD_CPP_ENABLE_ML_KEM_1024 is set, and document ML-KEM-1024 configuration for REST and gRPC.

[gemini-code-assist]

Code Review

This pull request introduces support for requesting the ML-KEM-1024 post-quantum cryptography algorithm. It adds documentation, updates the REST client to prepend MLKEM1024 when the GOOGLE_CLOUD_CPP_ENABLE_ML_KEM_1024 environment variable is set, and includes integration and unit tests. Feedback on the changes suggests using std::rotate for a more efficient in-place element move in ssl_ec_curves.cc, using structured bindings in map loops, and avoiding the use of auto when it obscures StatusOr return types in tests to align with the repository style guide.

[codecov]

Codecov Report

❌ Patch coverage is 98.50746% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.39%. Comparing base (e4357e4) to head (c6f8d7d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
google/cloud/internal/ssl_ec_curves_test.cc	98.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16571   +/-   ##
=======================================
  Coverage   92.39%   92.39%           
=======================================
  Files        2266     2266           
  Lines      219458   219516   +58     
=======================================
+ Hits       202771   202828   +57     
- Misses      16687    16688    +1     

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