Keep-going: tree shares, health flags, CI, compose, timestamp Zapier action

Directory-tree encrypted share mock; /health reports mockVerae/nats;
middleware OpenAPI extended; zappier receipt by jobId; activate Create
Timestamp (local mock or hosted); GitHub Actions test:offline; compose
builds zappier image; seed-demo.mjs.

No Zapier login or live Verae required.

harness/compose.yaml

@@ -25,16 +25,18 @@ services:
       - nats
 
   zappier:
-    image: node:20
-    working_dir: /app
-    volumes:
-      - ../packages/zappier:/app
-    command: ["npx", "ts-node", "src/index.ts"]
+    build: ../packages/zappier
     ports:
       - "3000:3000"
     environment:
       PORT: "3000"
-      ZAPPIER_DB: /app/data/zappier.db
+      ZAPPIER_DB: /data/zappier.db
       ADMIN_KEY: ${ADMIN_KEY:-admin-dev-key}
+      VERAE_MIDDLEWARE_URL: http://middleware:3100
+    volumes:
+      - zappier-data:/data
     depends_on:
       - middleware
+
+volumes:
+  zappier-data: