v2: extension points + author docs + demo preset #118

Job	Run time
Architecture and Documentation Guards	36s
Weekly Benchmark Diff	-1s
Performance Smoke Check	53s
Build and run tests (JDK 17)	1m 8s
Build and run tests (JDK 25)	54s
Build and run tests (JDK 21)	49s
Examples Generation Smoke Test	0s
	4m 19s

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