docs: align changelog section headers with git-cliff configuration

[vdusek]

Summary

• Add missing emojis to changelog section headers (Refactor → 🚜 Refactor, Chore → ⚙️ Miscellaneous Tasks)
• Update old-style section headers (Changed → 🚜 Refactor, Removed → 🚜 Refactor, Breaking changes → ⚙️ Miscellaneous Tasks with [**breaking**] tags)
• Fixes output of the git-cliff pipeline that previously omitted emojis for breaking changes of skipped commit types
• Related: fix(git-cliff-release): Add emojis for breaking changes of skipped commit types workflows#256

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.47%. Comparing base (21f2665) to head (eec71bf).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #661      +/-   ##
==========================================
+ Coverage   96.45%   96.47%   +0.02%     
==========================================
  Files          45       45              
  Lines        4318     4318              
==========================================
+ Hits         4165     4166       +1     
+ Misses        153      152       -1     

Flag	Coverage Δ
integration	94.71% <ø> (+0.25%)	⬆️
unit	78.04% <ø> (ø)

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