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ci + release: gate main on all five suites; one version, tag and draft release per bump; npm on publish #26

Job	Run time
build & typecheck	56s
repo invariants	7s
engine (typescript)	2m 53s
engine (javascript)	2m 53s
engine (java)	2m 52s
engine (csharp)	2m 52s
engine (python)	2m 52s
engines build on every platform / generate	29s
engines build on every platform / build-macos	1m 14s
engines build on every platform / build (windows-2025, win32-x64)	1m 6s
engines build on every platform / build (ubuntu-24.04-arm, linux-arm64)	1m 19s
engines build on every platform / build (ubuntu-24.04, linux-x64)	1m 21s
CI	3s
	20m 57s