Add approval mode selection

crates/crank-core/src/operation.rs

@@ -121,13 +121,25 @@ pub enum OperationApprovalPayloadPreviewMode {
     MaskedJson,
 }
 
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum OperationApprovalMode {
+    #[default]
+    Custom,
+    Elicitation,
+}
+
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
 pub struct OperationApprovalPolicy {
     pub required: bool,
+    #[serde(default)]
+    pub mode: OperationApprovalMode,
     pub risk_level: OperationApprovalRiskLevel,
     pub ttl_seconds: u32,
     pub show_payload_preview: bool,
     pub payload_preview_mode: OperationApprovalPayloadPreviewMode,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub elicitation_message: Option<String>,
 }
 
 #[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]