fix: send loaded revision before claiming controller boot

Author: mgazza

apps/predbat/control_handoff.py

@@ -247,6 +247,8 @@ def __init__(self, base, instance_id, boot_id, url, key, clock=time.monotonic):
     def _request(self, action, evidence=None):
         """Call the fixed service endpoint with redirects and exception logging off."""
         payload = {"action": action, "instance_id": self.instance_id, "boot_id": self.boot_id}
+        if action == "attach":
+            payload["loaded_config_version"] = self.base.args.get("saas_config_version")
         if self.gate is not None:
             payload["epoch"] = self.gate.epoch
         if evidence is not None:

apps/predbat/tests/test_control_handoff.py

@@ -473,7 +473,7 @@ def test_attach_uses_service_credentials_and_exact_boot(self):
         self.assertEqual(gate.epoch, self.epoch)
         call = post.call_args
         self.assertEqual(call.args[0], "https://service.invalid/functions/v1/engine-battery-control")
-        self.assertEqual(call.kwargs["json"], {"action": "attach", "instance_id": self.instance, "boot_id": self.boot})
+        self.assertEqual(call.kwargs["json"], {"action": "attach", "instance_id": self.instance, "boot_id": self.boot, "loaded_config_version": 7})
         self.assertFalse(call.kwargs["allow_redirects"])
         self.assertEqual(call.kwargs["headers"]["Authorization"], "Bearer synthetic-service-key")