Bootstrap copied BFF and local accounts with public Sendico contracts (#34)

backend/pkg/merrors/chain_execution.go

@@ -0,0 +1,21 @@
+package merrors
+
+import "strings"
+
+const (
+	ReasonChainExecutionSigningUnavailable          = "chain_execution.signing_unavailable"
+	ReasonChainExecutionUnsupportedCapability       = "chain_execution.unsupported_capability"
+	ReasonChainExecutionInsufficientBalance         = "chain_execution.insufficient_balance"
+	ReasonChainExecutionInsufficientNativeResources = "chain_execution.insufficient_native_resources"
+	ReasonChainExecutionDestinationIneligible       = "chain_execution.destination_ineligible"
+)
+
+// ChainExecutionPrecondition creates a typed, reason-bearing permanent
+// preparation failure. Callers can classify it with both errors.Is and Reason.
+func ChainExecutionPrecondition(reason, message string) error {
+	return classifiedError{
+		base:   ErrFailedPrecondition,
+		msg:    strings.TrimSpace(message),
+		reason: strings.TrimSpace(reason),
+	}
+}