⭐ Operators

@ngrx/operators — real source, 68/68 tests passing, 0 lint errors. Pure RxJS operator functions, audited clean — nothing here extends anything, so it's outside the scope of the composition-over-inheritance redesign entirely.

Small module, real consequence: adding it unblocked effects' own provide_effects.spec.ts, which had been failing until operators existed to satisfy a dependency — effects' test count moved from 388/388 to 404/404 once this landed. See Effects.