test: characterize contracts and make startup explicit

app.py

@@ -1,7 +1,7 @@
 from flask import Flask, render_template_string, request, redirect, url_for, flash
 import os
 
-from controller_core import enqueue_download
+from controller_core import enqueue_download, start_controller, stop_controller
 
 app = Flask(__name__)
 app.secret_key = os.environ.get("FLASK_SECRET_KEY", "dev-secret")
@@ -250,4 +250,8 @@ def submit():
     return redirect(url_for("index"))
 
 if __name__ == "__main__":
-    app.run(host="0.0.0.0", port=int(os.environ.get("PORT", 7531)))
+    start_controller()
+    try:
+        app.run(host="0.0.0.0", port=int(os.environ.get("PORT", 7531)))
+    finally:
+        stop_controller()