LicenseGate now exposes getState() (delegates to LicenseStateMachine),
getEffectiveLimits() (merged over DefaultTierLimits in ACTIVE/GRACE,
defaults-only in ABSENT/EXPIRED/INVALID), markInvalid(reason), and
clear(). Internal snapshot is an immutable record-like class swapped
atomically so concurrent reads see a consistent license+reason pair.
Removes the transient openSentinel() and getTier() introduced by
earlier tasks (no production consumers).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
0499a54ebc