Add the procurement topic and Supply's write access to it

reorder.requested and its answer (confirmed/rejected) share the topic, keyed
by the reorder id, so ordering between the ask and the answer holds the way it
does for a product's own facts on classic-models.catalog.

Supply both writes and reads this topic — one service, two capacities, not a
separate procurement identity, per the 2026-08-31 decision.

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

kafka-topology/classic-models.yaml

@@ -63,6 +63,25 @@ spec:
     retention.ms: "604800000"
     cleanup.policy: delete
     min.insync.replicas: "1"
+---
+# A supply request and its own answer, on one topic: reorder.requested and its
+# eventual reorder.confirmed/reorder.rejected share a subject — the reorder id
+# — so ordering between "asked" and "answered" holds the way it does for a
+# product's own facts on classic-models.catalog.
+apiVersion: kafka.strimzi.io/v1
+kind: KafkaTopic
+metadata:
+  name: classic-models.procurement
+  namespace: kafka
+  labels:
+    strimzi.io/cluster: kafka
+spec:
+  partitions: 3
+  replicas: 1
+  config:
+    retention.ms: "604800000"
+    cleanup.policy: delete
+    min.insync.replicas: "1"
 
 # --- accounts ---------------------------------------------------------------
 #
@@ -92,8 +111,12 @@ spec:
           - Write
           - Describe
 ---
-# The supply agent. Reads the catalog topic only — an agent whose job is stock
+# The supply agent. Reads the catalog topic — its job is stock, it has no
-# has no business reading who paid what.
+# business reading who paid what. It also both writes AND reads its own
+# procurement topic: it raises a reorder request and answers its own request
+# a moment later (this is one service acting in two capacities, not two
+# services, per the 2026-08-31 decision that réapprovisionnement stays one
+# service rather than splitting into a separate procurement identity).
 apiVersion: kafka.strimzi.io/v1
 kind: KafkaUser
 metadata:
@@ -114,6 +137,14 @@ spec:
         operations:
           - Read
           - Describe
+      - resource:
+          type: topic
+          name: classic-models.procurement
+          patternType: literal
+        operations:
+          - Read
+          - Write
+          - Describe
       - resource:
           type: group
           name: supply-