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ci + release: gate main on all five suites; one version, tag and draft release per bump; npm on publish #29

Job	Run time
what changed	8s
repo invariants	9s
build & typecheck	50s
engine (python)	4m 51s
engine (csharp)	12m 45s
engine (javascript)	5m 17s
engine (java)	10m 46s
engine (typescript)	10m 54s
engines build on every platform / generate	27s
engines build on every platform / build (windows-2025, win32-x64)	6m 46s
engines build on every platform / build-macos	11m 30s
engines build on every platform / build (ubuntu-24.04, linux-x64)	11m 32s
engines build on every platform / build (ubuntu-24.04-arm, linux-arm64)	11m 31s
CI	3s
	1h 27m 29s