feat(pipeline): unified run_target execution behind UNIFIED_PIPELINE (#145)

compliance-core/src/config.rs

@@ -49,6 +49,10 @@ pub struct AgentConfig {
     /// of tenants to iterate. When `None` or unreachable, scheduler
     /// falls back to `SCHEDULER_TENANT_IDS` env (M7.2-C).
     pub tenant_registry_url: Option<String>,
+    /// When true, `run_scan` dispatches to the unified `run_target` pipeline
+    /// (reads `onboarded_targets`) instead of the legacy repository pipeline.
+    /// Env `UNIFIED_PIPELINE`. Defaults off during the transition.
+    pub unified_pipeline: bool,
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize)]