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-zapier/test/app.test.js

@@ -28,6 +28,7 @@ describe('verae-zapier app definition', () => {
     assert.ok(App.creates.batch_timestamp);
     assert.ok(App.searches.job_status);
     assert.ok(App.searches.hash_lookup);
+    assert.ok(App.searches.tree_lookup);
     assert.ok(App.triggers.timestamp_completed);
   });