feat: pre-stage CHANGELOG before release-PR workflow #82

Job	Run time
Type Check	18s
Architecture (import-linter)	10s
Version bump check	7s
Unit tests	23s
Coverage	24s
Lint & Format	11s
Pre-commit	1m 8s
File length	6s
Commit-type sync	9s
Frontend Build	14s
Frontend Quality	17s
Branch-protection contexts sync	10s
src/ README audit	5s
Aspirational ticket cite	8s
Tests required	6s
Action pinning audit	6s
	4m 2s

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