Milestone 0: import zappier billing, Verae middleware, and Zapier research

Compose-ready workspace: packages/zappier (rate card, portal, Stripe),
packages/verae-zapier-middleware (timestamp + NATS), packages/verae-zapier
(CLI app), vendor/zapier-platform, and research/zapier vendor corpus.

Gate 0 structure checks pass. Product code and research are not yet wired.

harness/compose.yaml

@@ -0,0 +1,40 @@
+# Local disconnected stack (PR 3+). Zappier commercial edge is added in PR 4.
+# Middleware HTTP can run without NATS when NATS_ENABLED=false.
+
+services:
+  nats:
+    image: nats:2.10
+    command: ["-js", "-m", "8222"]
+    ports:
+      - "4222:4222"
+      - "8222:8222"
+
+  middleware:
+    build: ../packages/verae-zapier-middleware
+    ports:
+      - "3100:3100"
+    environment:
+      PORT: "3100"
+      VERAE_API_BASE_URL: ${VERAE_API_BASE_URL:-http://mock-verae:8080}
+      MOCK_VERAE: ${MOCK_VERAE:-true}
+      NATS_ENABLED: ${NATS_ENABLED:-false}
+      NATS_URL: nats://nats:4222
+      TOKEN_SECRET: ${TOKEN_SECRET:-dev-secret}
+      DEBUG_VERAE: ${DEBUG_VERAE:-}
+    depends_on:
+      - nats
+
+  zappier:
+    image: node:20
+    working_dir: /app
+    volumes:
+      - ../packages/zappier:/app
+    command: ["npx", "ts-node", "src/index.ts"]
+    ports:
+      - "3000:3000"
+    environment:
+      PORT: "3000"
+      ZAPPIER_DB: /app/data/zappier.db
+      ADMIN_KEY: ${ADMIN_KEY:-admin-dev-key}
+    depends_on:
+      - middleware