[wangyinz]

Fixes #829

This PR makes bulk normalization persist every field actually returned by a matcher, including present optional fields, while leaving absent optional fields absent and preserving alias/prepend behavior exactly as atomic normalization does.

Validation includes an independent agent review, all four alias/prepend combinations, full MongoDB-backed normalization regressions, an exact baseline-red suite, Black, Ruff, py_compile, and diff checks.

This PR is ready for human review. It must not be merged automatically.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.24%. Comparing base (69f44ae) to head (102edf0).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #972      +/-   ##
==========================================
- Coverage   72.24%   72.24%   -0.01%     
==========================================
  Files         182      182              
  Lines       36108    36103       -5     
  Branches     2532     2532              
==========================================
- Hits        26087    26082       -5     
  Misses       9115     9115              
  Partials      906      906              

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