Backport v6.4.3 changelog to main

[masih]

Originally merged to release branch only; see:

• Update Changelog in prep for release #3342

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	May 1, 2026, 9:27 AM

[kollegian]

lg

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.17%. Comparing base (b938c70) to head (86af515).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3355      +/-   ##
==========================================
- Coverage   59.22%   59.17%   -0.06%     
==========================================
  Files        2097     2097              
  Lines      172509   172507       -2     
==========================================
- Hits       102167   102077      -90     
- Misses      61479    61570      +91     
+ Partials     8863     8860       -3     

Flag	Coverage Δ
sei-db	70.41% <ø> (ø)

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see 33 files with indirect coverage changes

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