fix: fresh install archives stale state of a previous installation; a fatal Agent loop error stops the service instead of leaving a dead 'Running' one; 1.2.3

Found by uninstall + fresh install on the clean Windows Sandbox: the old agent_state.sqlite identity conflicted with the new enrollment and the service sat idle.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

central/tests/test_health.py

@@ -17,7 +17,7 @@ def test_health_is_unavailable_when_database_is_down():
 
 def test_version_endpoint_reports_release_and_fiscal_versions():
     body = TestClient(create_app(database_probe=lambda: True)).get("/version").json()
-    assert body["version"] == "1.2.2" and body["api_compat"] == "1.0" and body["engine_version"] and body["decision_version"]
+    assert body["version"] == "1.2.3" and body["api_compat"] == "1.0" and body["engine_version"] and body["decision_version"]
 
 
 def test_production_refuses_the_dev_token(monkeypatch):