docs: Ledger Live integration, contract deploy learnings, NEXT_STEPS updates

- ADD_CHAIN138_TO_LEDGER_LIVE: Ledger form done; public code review repo bis-innovations/LedgerLive; init/push commands
- CONTRACT_DEPLOYMENT_RUNBOOK: Chain 138 gas price 1 gwei, 36-addr check, TransactionMirror workaround
- CONTRACT_*: AddressMapper, MirrorManager deployed 2026-02-12; 36-address on-chain check
- NEXT_STEPS_FOR_YOU: Ledger done; steps completable now (no LAN); run-completable-tasks-from-anywhere
- MASTER_INDEX, OPERATOR_OPTIONAL, SMART_CONTRACTS_INVENTORY_SIMPLE: updates
- LEDGER_BLOCKCHAIN_INTEGRATION_COMPLETE: bis-innovations/LedgerLive reference

Co-authored-by: Cursor <cursoragent@cursor.com>

multi-chain-execution/scripts/integration-test.mjs

@@ -0,0 +1,77 @@
+#!/usr/bin/env node
+/**
+ * Minimal integration test for multi-chain execution API.
+ * Creates intent 138 -> 651940, executes, and verifies execution.
+ * Assumes deterministic contract addresses: same address on 138 and 651940 (CREATE2).
+ * Run with: BASE_URL=http://localhost:3001 node scripts/integration-test.mjs
+ * Prerequisite: npm run build && npm start (in another terminal).
+ */
+
+const BASE = process.env.BASE_URL || 'http://localhost:3001';
+
+async function request(method, path, body = null) {
+  const opts = { method, headers: {} };
+  if (body) {
+    opts.headers['Content-Type'] = 'application/json';
+    opts.body = JSON.stringify(body);
+  }
+  const res = await fetch(`${BASE}${path}`, opts);
+  const text = await res.text();
+  if (!res.ok) throw new Error(`${res.status} ${path}: ${text}`);
+  return text ? JSON.parse(text) : {};
+}
+
+async function main() {
+  console.log('Integration test (138 -> 651940, deterministic addresses assumed)\n');
+
+  const health = await request('GET', '/v1/health');
+  console.log('Health:', health.status, health.circuit_breaker);
+  if (health.status !== 'ok' && health.status !== 'degraded') {
+    throw new Error('Health check failed');
+  }
+
+  const intentPayload = {
+    type: 'cross_chain',
+    chain_from: 138,
+    chain_to: 651940,
+    asset_in: 'native',
+    asset_out: 'native',
+    amount: '1000000',
+    idempotency_key: `integration-${Date.now()}`,
+  };
+  const intent = await request('POST', '/v1/intents', intentPayload);
+  if (!intent.intent_id) throw new Error('No intent_id');
+  console.log('Intent created:', intent.intent_id);
+
+  const exec = await request('POST', `/v1/intents/${intent.intent_id}/execute`);
+  if (!exec.execution_id) throw new Error('No execution_id');
+  console.log('Execution started:', exec.execution_id);
+
+  const execution = await request('GET', `/v1/executions/${exec.execution_id}`);
+  console.log('Execution status:', execution.status || execution);
+
+  const commitPayload = {
+    chain_id: 138,
+    leaves: [{
+      chainId: 138,
+      txHash: '0x' + '0'.repeat(64),
+      blockNumber: '100',
+      receiptRootOrLogsBloom: '0x00',
+      normalizedEventPayloadHash: '0x00',
+      salJournalEntryHash: null,
+    }],
+    uri: 'https://example.com/leaves',
+  };
+  const commit = await request('POST', '/v1/mirror/commit', commitPayload);
+  if (commit.commit_id) {
+    const got = await request('GET', `/v1/mirror/commits/${commit.commit_id}`);
+    console.log('Mirror commit verified:', got.commit_id === commit.commit_id);
+  }
+
+  console.log('\nIntegration test OK (deterministic addresses assumed for 138 and 651940).');
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});