Finish KG-WP-0003: stream completeness and live qonto observation

Classify evidence as load-bearing or attributive, draft the emission-cadence
declaration for Taxonomy, treat silence as a stream finding, keep completeness
separate from record richness, forbid immune memory as a state plane, and make
containment proposals reconstructable to their origin. Observe real
qonto-assistant audit events; deny-class completeness stays unknown until the
source publishes a heartbeat.

Assistant: grok
Assistant-Session: 01a05ef1-9e5a-70f2-b0ff-0b05d6b38ae9

tests/helpers.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from collections.abc import Mapping
+
+from kings_guard.adapters import observation_from_audit_event
+from kings_guard.contracts import ImmuneObservation
+from kings_guard.fixtures import QontoAssistantPilotFixture, load_qonto_assistant_pilot
+
+
+def load_pilot() -> QontoAssistantPilotFixture:
+    return load_qonto_assistant_pilot()
+
+
+def observation_from_fixture(
+    fixture: QontoAssistantPilotFixture | None = None,
+    event: Mapping[str, object] | None = None,
+) -> ImmuneObservation:
+    fixture = fixture or load_qonto_assistant_pilot()
+    return observation_from_audit_event(
+        event or fixture.audit_event,
+        subject_id=fixture.normalization_hints["subject_id"],
+        capability_scope=fixture.normalization_hints["capability_scope"],
+        identity_binding=fixture.normalization_hints["identity_binding"],
+        egress_destination=fixture.normalization_hints["egress_destination"],
+        genome=fixture.genome,
+    )