v1.6.2 robustness: glyph sanitizer + capacity tolerance + LayerStack row + error messages #91

Job	Run time
Architecture and Documentation Guards	37s
Weekly Benchmark Diff	0s
Performance Smoke Check	55s
Build and run tests (JDK 25)	50s
Build and run tests (JDK 21)	52s
Build and run tests (JDK 17)	1m 12s
Examples Generation Smoke Test	41s
	5m 7s

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