feat!: upgrade all packages to AI SDK v7 stable (#21) #90

Job	Run time
Lint workflows (actionlint + zizmor)	11s
Lint, typecheck, test, build (Node 24)	40s
Lint, typecheck, test, build (Node 22)	50s
Lint, typecheck, test, build (Node 26.3.0)	43s
Required	3s
	2m 27s

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