Add Zapier interface simulator, tree-node Merkle lookups, and user docs

In-process trace console validates hops, faults, recoveries, and
suggested changes before zapier-platform push. User guide covers
signup through central-chain and bulk-summary tree-node hash lookup.

packages/verae-tree-node/package.json

@@ -0,0 +1,8 @@
+{
+  "name": "verae-tree-node",
+  "version": "0.1.0",
+  "type": "module",
+  "description": "Merkle leaf proofs for hashes only sealed as a bulk summary root on the main Verae chain",
+  "scripts": { "test": "node --test test/*.test.js" },
+  "engines": { "node": ">=20" }
+}