deviation_engine: link kpi_value_id on deviation/trend alert rows; skip when period not attributable or kpi_values row missing; dedupe key now (entity_id,kpi_id,kpi_value_id,alert_type)
deviation_push: same-source R1/R5 guards, no-period request writes nothing
tests: add test_alert_caliber_r5_residual_20260919 (13 cases incl. negative controls); adapt r1r4/r5 fixtures to the supplemental ruling
R1: exclude status=demo entities from alert traversal (alert_generator / deviation_engine / kpi_bep_deriver / alert_rules / cash engine)
R2: only generate alerts within the last 6 calendar months (incl. current)
R3: only regular month periods (YYYY-MM) participate
R4: decouple generation from push - empty notification_channels never blocks
Single source of truth: app/utils/alert_entity_scope.py
Hermes CI Fix