Wire protocol (proto)

Sidecar ↔ ledger ↔ canonical ingest gRPC contracts live under proto/spendguard/:

• common/v1/common.proto — shared types (BudgetClaim, CloudEvent, Idempotency, Fencing, Replay, Error, etc.)
• ledger/v1/ledger.proto — ledger SP RPCs (ReserveSet, CommitEstimated, ProviderReport, InvoiceReconcile, Release, RecordDeniedDecision, …)
• canonical_ingest/v1/canonical.proto — AppendEvents (audit chain)
• sidecar_adapter/v1/adapter.proto — adapter UDS surface (RequestDecision, EmitTraceEvent, ConfirmPublishOutcome, etc.)

SDK proto stubs are auto-generated via make proto in sdk/python/.