Scheduled ingest: file watcher auto-ingests from ./inbox

- Drop CSV/JSON/PDF/text into ./inbox → auto-detected → Parquet → queryable
- Polls every 10 seconds (configurable)
- Processed files moved to ./inbox/processed/
- Failed files moved to ./inbox/failed/
- Dedup: same file dropped twice = no-op
- Watcher starts automatically on gateway boot
- Tested: CSV dropped → queryable in <15s

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/gateway/src/main.rs

@@ -108,6 +108,13 @@ async fn main() {
             .allow_headers(Any))
         .layer(TraceLayer::new_for_http());
 
+    // File watcher — auto-ingest from ./inbox
+    let _watcher = ingestd::watcher::spawn_watcher(
+        ingestd::watcher::WatchConfig::default(),
+        store.clone(),
+        registry.clone(),
+    );
+
     // Start gRPC server on port+1
     let grpc_port = config.gateway.port + 1;
     let catalog_grpc = catalogd::grpc::CatalogGrpc::new(registry);