When developing on a physical iPhone via `./dev-iphone.sh`, Metro runs
with whatever env the user's shell has — and the FamilyControls flag
was missing unless the user remembered to prefix every command with
`REBREAK_ENABLE_FAMILY_CONTROLS=1 …`. Forgetting it meant
`app.config.ts` evaluated `process.env.REBREAK_ENABLE_FAMILY_CONTROLS`
to falsy, so the JS bundle had `extra.familyControlsEnabled = false`
and the Blocker page kept showing "App-Lock — Bald" instead of the
real LayerSwitchCard, even though the dev binary did have the FC
entitlement.
Local dev scripts now default the var to "1" with shell-level
override (e.g. `REBREAK_ENABLE_FAMILY_CONTROLS=0 ./dev-iphone.sh`
when you want to verify the TestFlight/prod fallback UI). EAS
profile env (eas.json) keeps its own explicit setting and is
unaffected.
