chore: initialize from backend template 0a6dd0e

infra/httpclient/toxiproxy/compose.yaml

@@ -0,0 +1,17 @@
+# Fault-injection topology for the HTTP Client Platform failure suite (design §28.1, §28.3).
+#
+# The suite normally drives Toxiproxy through Testcontainers. This compose file exists for the
+# nightly lane and for reproducing a failure locally with the exact same image and ports.
+services:
+  toxiproxy:
+    image: ghcr.io/shopify/toxiproxy:2.9.0
+    container_name: httpclient-toxiproxy
+    ports:
+      - "8474:8474"   # control API
+      - "18080:18080" # proxied upstream: plaintext
+      - "18443:18443" # proxied upstream: TLS
+    healthcheck:
+      test: ["CMD", "/toxiproxy-cli", "list"]
+      interval: 5s
+      timeout: 3s
+      retries: 10