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-archive-aggregator/test/aggregate.test.js

@@ -25,4 +25,20 @@ describe('aggregateAttached', () => {
     assert.equal(merged[0].kind, 'seal');
     assert.equal(merged[1].kind, 'metadata-attach');
   });
+
+  it('merges tree-leaf receipts from bulk summaries', () => {
+    const seal = [{ kind: 'seal', of: 'merkleRoot', sha256: 'aa'.repeat(32) }];
+    const recs = [
+      {
+        kind: 'tree',
+        archiveId: 'tree-node-east',
+        storedAt: '2026-01-02T00:00:00Z',
+        record: { merkleRoot: 'aa'.repeat(32), leafIndex: 1, proof: [] },
+      },
+    ];
+    const merged = mergeReceipts(seal, recs);
+    assert.equal(merged[1].kind, 'tree-leaf');
+    assert.equal(merged[1].itemizedOnMainChain, false);
+    assert.equal(merged[1].archiveId, 'tree-node-east');
+  });
 });