eustatos / nexus-state / 23602700180 / 4 – family

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feat(core): defer atom registration until first store access

- Remove immediate registration of named atoms in atom() function
- Atoms are now registered only when accessed via store.get(), store.set(), or store.subscribe()
- This ensures atoms are registered in the correct registry (global or isolated per-store)
- Enables proper SSR isolation without global registry contamination
- Aligns with native signal approach (no global state)

BREAKING CHANGE: Named atoms are no longer registered immediately on creation.
Registration happens on first store access. Code that relies on immediate
registration (e.g., checking atomRegistry.isRegistered() before store access)
needs to be updated.

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