Found by LIVE VALIDATION, not by a unit test: the first demo tier-2 run pushed
'Masodlagos mentes elkeszult: _shares' — the reserved key reached Hungarian
customer/operator copy.
Mapped at the SOURCE of the notification (RunSharesTier2's tier2Notify calls) so no
future notifier wiring can reintroduce it, plus DisplayStackName at the main.go
wiring as idempotent defense in depth. Regression test added with a red-proof.
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