- Tier enum: LOW→STARTER, MID→TEAM, HIGH→BUSINESS, BUSINESS→ENTERPRISE
- LicenseDefaults: 13-key limits per tier matching server handoff cap matrix
- Drop features concept from LicenseEntity, LicenseResponse, portal DTOs
- Add label and gracePeriodDays to LicenseEntity
- Fix agent limit key from 'agents' to 'max_agents' in VendorTenantController
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>