⭐ Data

@ngrx/data — real source, 1166/1166 tests passing, 0 lint errors, the largest module added. Audited clean on its own logic, but the composition-over-inheritance ripple showed up here in a third distinct shape: ScannedActionsSubject mistyped as a plain Observable at a call site, different from the patterns already seen in effects and router-store/store-devtools.

Also fixed 2 real upstream bugs found during the addition — a dead store and a variable-shadowing issue, both pre-existing in the original import. Not yet covered by the code review audit; queued behind store-devtools.