InferenceDevices Private Cloud

Staging control plane — pretest skeleton (Stage 0.75).

• /health — service health
• GET /api/tenants · POST /api/tenants — tenant registry
• GET /api/ledger · POST /api/ledger — usage ledger
• POST /api/nodes/{name}/heartbeat — node heartbeat
• GET /api/artifacts/ping — R2 binding check

No production data. No auth yet — Access lands in a later leg.