fix: derived createStore now returns readonly store

[crutchcorn]

This PR makes it harder to accidentally run setState on a readonly store

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 69fd163

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	37s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	<1s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-02-17 07:44:53 UTC

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commit: 69fd163