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.

packages/zappier/src/pricing.ts

@@ -66,6 +66,7 @@ export const DEFAULT_RATE_CARD: RateCard = {
     add: { kind: 'free' },
     timestamp: { kind: 'fixed', fixedCents: 4 },
     'hash-lookup': { kind: 'free' },
+    receipt: { kind: 'free' },
     storage: { kind: 'variable', baseCents: 10, perKbCents: 1, perMbCents: 50 },
   },
 };