migrated checkpoint handling in integrity.rs to ssot principle

src/corporate/collect_exchanges.rs

@@ -245,7 +245,7 @@ fn get_fallback_rate(currency: &str) -> f64 {
 /// - Integrity tracking with content hash validation
 pub async fn collect_and_save_exchanges(paths: &DataPaths) -> anyhow::Result<usize> {
     let state_path = paths.data_dir().join("state.jsonl");
-    let manager = StateManager::new(&state_path, &paths.data_dir().to_path_buf());
+    let manager = StateManager::new(&state_path, &paths.data_dir().to_path_buf())?;
     let step_name = "exchange_collection_complete";
     
     let output_path = paths.data_dir().join("yahoo_exchanges.json");
@@ -407,7 +407,6 @@ async fn track_exchange_collection_completion(
         step_name.to_string(),
         content_reference,
         DataStage::Data,
-        vec![],  // No explicit dependencies - output file serves as verification
         None,    // Use default TTL (7 days for Data stage)
     ).await?;