Update v6.6 change log in prep to cut v6.6.4 patch

[alexander-sei]

Systematic changelog re-generation for the v6.6.4 patch release.

Adds the PRs merged to release/v6.6 since v6.6.3, as reported by scripts/generate-changelog.sh release/v6.5 release/v6.6:

• Initialize app from last header on frozen restart for v6.6 #4448 Initialize app from last header on frozen restart for v6.6
• Bump version to v6.6.3 in prep for patch release #4056 Bump version to v6.6.3 in prep for patch release
• Backport release/v6.6: Update v6.6 change log in prep to cut v6.6.3 patch #4055 Backport release/v6.6: Update v6.6 change log in prep to cut v6.6.3 patch

Made with Cursor

[seidroid]

Settled by the scouts (codex) without a review turn: every one of them read the diff, found nothing, and reported it inert -- comments, documentation or whitespace only, with no executable surface changed.

_{seidroid review · decision approve · settled by the scouts codex · no review turn ran}

Findings: 0 blocking | 0 non-blocking | 0 posted inline

[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	Oct 6, 2026, 9:27 AM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.80%. Comparing base (0b93e66) to head (a942ad3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4466      +/-   ##
==========================================
- Coverage   56.81%   56.80%   -0.01%     
==========================================
  Files        2127     2127              
  Lines      167022   167022              
==========================================
- Hits        94888    94879       -9     
- Misses      72129    72138       +9     
  Partials        5        5              

Flag	Coverage Δ
sei-chain	54.98% <ø> (-0.01%)	⬇️
sei-db	75.17% <ø> (ø)
sei-db-state-db	78.84% <ø> (+0.01%)	⬆️

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see 27 files with indirect coverage changes

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[seidroid]

Successfully created backport PR for release/v6.6:

• Backport release/v6.6: Update v6.6 change log in prep to cut v6.6.4 patch #4468