Update v6.7 change log in prep to cut v6.7.1 patch

[alexander-sei]

Systematic changelog re-generation for the v6.7.1 patch release.

Adds the PRs merged to release/v6.7 since the v6.7.0 changelog (#4443), as reported by scripts/generate-changelog.sh release/v6.6 release/v6.7:

• Backport release/v6.7: Make the composite store router an atomic pointer #4473 Backport release/v6.7: Make the composite store router an atomic pointer
• Backport release/v6.7: fix(seidb): keep the memIAVL nonce when state sync restores a mid-mig… #4465 Backport release/v6.7: fix(seidb): keep the memIAVL nonce when state sync restores a mid-mig…
• Backport release/v6.7: Update v6.7 changelog in prep to cut v6.7.0 #4445 Backport release/v6.7: Update v6.7 changelog in prep to cut v6.7.0
• Bump version to v6.7.0 in prep for release #4444 Bump version to v6.7.0 in prep for release

Only the ## v6.7 PR list changes, so the backport release/v6.7 cherry-pick applies cleanly (simulated with git merge-tree against origin/release/v6.7).

Not included: #4474 (the release/v6.7 backport of #4469), which is still open. If it lands before the cut, this list needs regenerating.

[cursor]

PR Summary

Low Risk
Documentation-only changelog update with no code or configuration changes.

Overview
Updates CHANGELOG.md for the upcoming v6.7.1 patch by prepending four merged release/v6.7 PRs to the top of the ## v6.7 list (per scripts/generate-changelog.sh), covering the composite store router atomic-pointer backport, memIAVL nonce preservation on mid-migration state sync, and the v6.7.0 changelog/version bump entries.

No runtime or application code changes—documentation only ahead of the patch cut.

^{Reviewed by Cursor Bugbot for commit 22ff6b9. Bugbot is set up for automated code reviews on this repo. Configure here.}

[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, 4:42 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.91%. Comparing base (6dd7d69) to head (22ff6b9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4481   +/-   ##
=======================================
  Coverage   56.90%   56.91%           
=======================================
  Files        2130     2130           
  Lines      167520   167520           
=======================================
+ Hits        95335    95343    +8     
+ Misses      72180    72172    -8     
  Partials        5        5           

Flag	Coverage Δ
sei-chain	55.10% <ø> (+<0.01%)	⬆️
sei-db	75.17% <ø> (ø)
sei-db-state-db	78.89% <ø> (+0.02%)	⬆️

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see 24 files with indirect coverage changes

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[seidroid]

Successfully created backport PR for release/v6.7:

• Backport release/v6.7: Update v6.7 change log in prep to cut v6.7.1 patch #4506