Add game/input/procgen exports to runtime package.json, fix hello-wor… #85

Job	Run time
TypeScript tests (Node)	13s
API declarations up-to-date	10s
Full build (with renderer + audio)	40s
Headless build (no GPU)	22s
Rust tests	1m 1s
TypeScript tests (V8)	4m 13s
	6m 39s

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