fix(agent): accept JSON null pre-decision evidence

apps/api/src/jobs/awooop_ansible_candidate_backfill_job.py

@@ -188,7 +188,10 @@ async def verify_ansible_candidate_pre_decision_evidence(
                     FROM incident_evidence
                     WHERE id = :snapshot_id
                       AND incident_id = :incident_id
-                      AND post_execution_state IS NULL
+                      AND (
+                          post_execution_state IS NULL
+                          OR CAST(post_execution_state AS jsonb) = 'null'::jsonb
+                      )
                       AND sensors_succeeded > 0
                       AND NULLIF(recent_logs, '') IS NOT NULL
                       AND EXISTS (

apps/api/src/services/awooop_ansible_check_mode_service.py

@@ -967,7 +967,11 @@ async def _load_pre_decision_context_runtime_stage_receipts(
                       ON candidate.op_id = CAST(:candidate_op_id AS uuid)
                     WHERE evidence.incident_id = CAST(:incident_id AS varchar(30))
                       AND evidence.collected_at <= candidate.created_at
-                      AND evidence.post_execution_state IS NULL
+                      AND (
+                          evidence.post_execution_state IS NULL
+                          OR CAST(evidence.post_execution_state AS jsonb)
+                              = 'null'::jsonb
+                      )
                       AND (
                           NULLIF(evidence.recent_logs, '') IS NOT NULL
                           OR evidence.mcp_health IS NOT NULL