eustatos / nexus-state / 23642968821 / 10 – immer

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refactor(core): atom = identity + logic (state in Store)

ARCHITECTURE: Atom is a label, not state container
- Atoms register lazily on first store.get/set/subscribe()
- State lives in Store, not in Atom
- Global registry stores atom references + metadata only

CHANGES:
- atom.ts: Remove immediate registration, lazy-only
- atom-registry.ts: Store references + metadata (not values)
- StoreImpl.ts: Fast-path registration in createGetter()
- TimeTravelController.ts: Store-specific tracking with DEV warnings

BENEFITS:
✅ SSR Isolation: One atom, different states per store
✅ Time-travel: Snapshots are store-specific
✅ Memory: States GC'd with store, atoms lightweight
✅ Multi-store: Shared atoms work correctly

PERFORMANCE:
- Baseline (atom creation): 25x faster (124ms → 5ms)
- Factory (createReactiveValue): 4x faster (285ms → 67ms)
- Overhead % appears higher due to smaller baseline

TESTS:
- Updated tests for explicit atom access before capture
- 1259/1259 core tests passed
- 99/99 time-travel tests passed

Refs: #71

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