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ci + release: gate main on all five suites; one version, tag and draft release per bump; npm on publish #33

Job	Run time
what changed	7s
build & typecheck	56s
repo invariants	10s
engine (python)	2m 4s
engine (java)	2m 5s
engine (javascript)	2m 4s
engine (typescript)	2m 4s
engine (csharp)	2m 5s
engines build on every platform / generate	29s
engines build on every platform / build-macos	18s
engines build on every platform / build (ubuntu-24.04-arm, linux-arm64)	7s
engines build on every platform / build (windows-2025, win32-x64)	17s
engines build on every platform / build (ubuntu-24.04, linux-x64)	10s
CI	2s
	12m 58s