Smart Engine Platform Backoffice

GetPlatformSummary exposes platform inventory for infranotes-accounting-engine
through the existing smart_engine.v1.SmartEngine gRPC service.

The engine accepts workload JWTs through the existing gRPC auth interceptor.
Browser/user authorization should be enforced by Gateway/IAM before Gateway
invokes this RPC. The response reports:

• Rule management coverage: Smart Engine rules and rule-set versions.
• Evaluation audit coverage: evaluation logs and anomaly dismissals.
• Feedback and statistics coverage: feedback records and rule-accuracy
  statistics.

Tenant registration approvals, package subscriptions, seats, and entitlements
remain owned by infranotes-iam.

Count Accuracy

Counts use short-lived cached PostgreSQL table statistics for the hardcoded
summary table allowlist. If a table later enables forced row-level security, the
summary keeps isolation intact by returning the same estimated statistics with
status=degraded and count_accuracy=estimated.

Rollback: revert the endpoint commit. No migrations or datastore changes are
required.