feat: pre-stage CHANGELOG before release-PR workflow (#168 backport) … #83

Job	Run time
Type Check	17s
Pre-commit	1m 6s
Coverage	22s
Architecture (import-linter)	11s
Lint & Format	10s
Unit tests	23s
Aspirational ticket cite	9s
File length	10s
Branch-protection contexts sync	9s
src/ README audit	6s
Frontend Quality	18s
Frontend Build	16s
Action pinning audit	7s
Commit-type sync	24s
Tests required	0s
Version bump check	0s
	4m 8s

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