LicenseManager currentLicenseKey accessor & JwtLicenseManager checkExpiry

[fupelaqu]

Description

Add two foundational capabilities to the licensing module that are prerequisites for Story 5.7 (License Refresh Strategy & SQL Commands, Issue #70).

1. currentLicenseKey accessor on LicenseManager trait

LicenseManager currently exposes licenseType, quotas, graceStatus but not the underlying LicenseKey. The SHOW LICENSE command (Issue #70) needs expiresAt which is only available on LicenseKey.

• Add def currentLicenseKey: LicenseKey = LicenseKey.Community default method to LicenseManager trait (backward compatible)
• Override in JwtLicenseManager to return state.get().licenseKey

2. checkExpiry() method on JwtLicenseManager

JwtLicenseManager.validate() stores state at call time but never re-checks expiry. Without runtime expiry checking, a JWT valid at initialize() time remains Pro/Enterprise forever in the in-memory state — making mid-session Community fallback unimplementable.

• Add checkExpiry() method that re-checks stored LicenseKey.expiresAt against Instant.now()
• If expired beyond grace period: calls resetToCommunity()
• If expired but within grace period: recomputes GraceStatus (EarlyGrace/MidGrace)
• If not expired: no-op
• Idempotent and cheap — just compares timestamps

Module

licensing

Related

• Issue License Refresh Strategy & SQL Commands #70 — License Refresh Strategy & SQL Commands (depends on this)
• Issue Expiry Grace Period & Degradation #67 — Expiry Grace Period & Degradation (prerequisite, FIXED)
• Issue JWT License Key Validation (Ed25519) #63 — JWT License Key Validation