Module tenant 

K2K tenant registry, quotas, and per-engagement cost tracking.

This module implements the lower-level, per-message tenancy boundary used inside the K2K broker. It is distinct from the governance-level crate::tenancy module (which uses string tenant IDs and coarse kernel-count / memory quotas). Here, TenantId is a u64 that matches the format stamped into per-message envelopes and into GPU-side routing tables.

Responsibilities

• Register tenants with TenantQuota limits
• Check quotas on kernel registration and message sends
• Track billable GPU-seconds per (tenant_id, audit_tag) pair
• Emit audit events for cross-tenant attempts via AuditSink

Structs

TenantInfo

Per-tenant bookkeeping stored inside TenantRegistry.

TenantQuota

Per-tenant quota and cost tracking limits.

TenantRegistry

Registry of active tenants with per-tenant quotas and per-engagement cost accounting.

Constants

UNSPECIFIED_TENANT

Reserved tenant ID meaning “no tenant specified” (backward-compat default).

Type Aliases

TenantId

Stable tenant identifier as used in K2K routing tables and message envelopes.