# Phase 7 Implementation: SaaS Hardening

## Delivered scope

### Quotas and plan enforcement hooks
- Added `QuotaService` for tenant resource checks.
- Added `BillingHooksService` for usage event emission.
- Added APIs:
  - `POST /api/v1/saas/quotas/check`
  - `POST /api/v1/saas/usage-events`

### Webhook management
- Added webhook controller for endpoint CRUD/test placeholders.
- Added APIs:
  - `GET /api/v1/webhooks`
  - `POST /api/v1/webhooks`
  - `POST /api/v1/webhooks/test`

### Scoped public API
- Added token service and public API controller.
- Added APIs:
  - `POST /api/v1/public/tokens`
  - `POST /api/v1/public/tokens/introspect`

## Data model additions
- `plan_limits`
- `usage_counters`
- `webhook_endpoints`
- `webhook_deliveries`
- `public_api_tokens`

## Notes
- This phase establishes hardening boundaries and contracts.
- Token/hash generation, secret encryption, and retry workers are the next productionization tasks.