chore: cut [1.0.3] CHANGELOG section; bump CMake project version to 1… #59

Job	Run time
Python Type Checking (mypy)	19s
Strict dimensional validation	1m 43s
Windows diagram-dot	4m 8s
Windows core-only	3m 20s
Linux server-enabled	49m 34s
Diagram Render Smoke	1m 21s
Python Linting (ruff)	14s
Linux json	1m 47s
Linux yaml	2m 7s
Linux core-only	1m 30s
Linux diagram-dot	1m 41s
	1h 7m 44s

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