wire interstitial insertion into schedule engine resolve_block

crates/domain/src/models/channel.rs

@@ -426,6 +426,16 @@ impl ProgrammingBlock {
     pub fn mid_roll_rule(&self) -> Option<&MidRollRule> {
         self.mid_roll_rule.as_ref()
     }
+
+    pub fn with_interstitial_rule(mut self, rule: InterstitialRule) -> Self {
+        self.interstitial_rule = Some(rule);
+        self
+    }
+
+    pub fn with_mid_roll_rule(mut self, rule: MidRollRule) -> Self {
+        self.mid_roll_rule = Some(rule);
+        self
+    }
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]