add functional tests for 7 major SDKs (Python, Go, JS, Ruby, PHP, Java, Rust)

Each test file covers 10 real API tests matching the C SDK reference:
health_check, validate_keys, get_languages, execute, execute_error,
session_list, session_lifecycle, service_list, snapshot_list, image_list.

All tests skip cleanly without credentials. No soft passes.
Updated all 7 Makefiles to run dedicated functional test files.

clients/javascript/sync/tests/test_functional.mjs

@@ -0,0 +1,184 @@
+// This is free software for the public good of a permacomputer hosted at
+// permacomputer.com, an always-on computer by the people, for the people.
+// One which is durable, easy to repair, & distributed like tap water
+// for machine learning intelligence.
+//
+// The permacomputer is community-owned infrastructure optimized around
+// four values:
+//
+//   TRUTH      First principles, math & science, open source code freely distributed
+//   FREEDOM    Voluntary partnerships, freedom from tyranny & corporate control
+//   HARMONY    Minimal waste, self-renewing systems with diverse thriving connections
+//   LOVE       Be yourself without hurting others, cooperation through natural law
+//
+// This software contributes to that vision by enabling code execution across 42+ programming languages through a unified interface, accessible to all.
+// Code is seeds to sprout on any abandoned technology.
+
+/**
+ * UN JavaScript SDK - Functional Tests
+ *
+ * Tests library functions against real API.
+ * Requires: UNSANDBOX_PUBLIC_KEY, UNSANDBOX_SECRET_KEY
+ *
+ * Usage:
+ *   node clients/javascript/sync/tests/test_functional.mjs
+ */
+
+import {
+  executeCode,
+  getLanguages,
+  listSessions,
+  createSession,
+  deleteSession,
+  listServices,
+  listSnapshots,
+  listImages,
+  validateKeys,
+  healthCheck,
+} from '../src/un.js';
+
+const GREEN = '\x1b[32m';
+const RED = '\x1b[31m';
+const BLUE = '\x1b[34m';
+const YELLOW = '\x1b[33m';
+const NC = '\x1b[0m';
+
+let passed = 0;
+let failed = 0;
+
+function check(condition, msg) {
+  if (condition) {
+    console.log(`  ${GREEN}✓${NC} ${msg}`);
+    passed++;
+  } else {
+    console.log(`  ${RED}✗${NC} ${msg}`);
+    failed++;
+  }
+}
+
+async function testHealthCheck() {
+  console.log('\nTesting healthCheck()...');
+  const result = await healthCheck();
+  check(typeof result === 'boolean', 'healthCheck returns boolean');
+}
+
+async function testValidateKeys() {
+  console.log('\nTesting validateKeys()...');
+  const info = await validateKeys();
+  check(info != null, 'validateKeys returns non-null');
+  check(info.valid === true, 'keys are valid');
+  if (info.tier) console.log(`    tier: ${info.tier}`);
+}
+
+async function testGetLanguages() {
+  console.log('\nTesting getLanguages()...');
+  const langs = await getLanguages();
+  check(Array.isArray(langs), 'getLanguages returns array');
+  check(langs.length > 0, 'at least one language returned');
+  check(langs.includes('python'), 'python is in languages list');
+  console.log(`    Found ${langs.length} languages`);
+}
+
+async function testExecute() {
+  console.log('\nTesting executeCode()...');
+  const result = await executeCode('python', "print('hello from JS SDK')");
+  check(result != null, 'execute returns non-null');
+  check(result.stdout && result.stdout.includes('hello from JS SDK'), 'stdout contains expected output');
+  check(result.exit_code === 0, 'exit code is 0');
+}
+
+async function testExecuteError() {
+  console.log('\nTesting executeCode() with error...');
+  const result = await executeCode('python', 'import sys; sys.exit(1)');
+  check(result != null, 'execute returns non-null');
+  check(result.exit_code === 1, 'exit code is 1');
+}
+
+async function testSessionList() {
+  console.log('\nTesting listSessions()...');
+  const sessions = await listSessions();
+  check(Array.isArray(sessions), 'listSessions returns array');
+  console.log(`    Found ${sessions.length} sessions`);
+}
+
+async function testSessionLifecycle() {
+  console.log('\nTesting session lifecycle (create, destroy)...');
+
+  const session = await createSession('python');
+  check(session != null, 'createSession returns non-null');
+  const sessionId = session.session_id || session.id;
+  check(sessionId != null, 'session has id');
+  console.log(`    session_id: ${sessionId}`);
+
+  if (sessionId) {
+    const destroyed = await deleteSession(sessionId);
+    check(destroyed != null, 'deleteSession returns non-null');
+  }
+}
+
+async function testServiceList() {
+  console.log('\nTesting listServices()...');
+  const services = await listServices();
+  check(Array.isArray(services), 'listServices returns array');
+  console.log(`    Found ${services.length} services`);
+}
+
+async function testSnapshotList() {
+  console.log('\nTesting listSnapshots()...');
+  const snapshots = await listSnapshots();
+  check(Array.isArray(snapshots), 'listSnapshots returns array');
+  console.log(`    Found ${snapshots.length} snapshots`);
+}
+
+async function testImageList() {
+  console.log('\nTesting listImages()...');
+  const images = await listImages();
+  check(Array.isArray(images), 'listImages returns array');
+  console.log(`    Found ${images.length} images`);
+}
+
+// Main
+async function main() {
+  console.log('=====================================');
+  console.log('UN JavaScript SDK - Functional Tests');
+  console.log('Testing against real API');
+  console.log('=====================================');
+
+  if (!process.env.UNSANDBOX_PUBLIC_KEY || !process.env.UNSANDBOX_SECRET_KEY) {
+    console.log(`\n${YELLOW}SKIP: UNSANDBOX_PUBLIC_KEY and UNSANDBOX_SECRET_KEY not set${NC}`);
+    process.exit(0);
+  }
+
+  const tests = [
+    testHealthCheck,
+    testValidateKeys,
+    testGetLanguages,
+    testExecute,
+    testExecuteError,
+    testSessionList,
+    testSessionLifecycle,
+    testServiceList,
+    testSnapshotList,
+    testImageList,
+  ];
+
+  for (const test of tests) {
+    try {
+      await test();
+    } catch (err) {
+      console.log(`  ${RED}✗${NC} ${test.name}: ${err.message}`);
+      failed++;
+    }
+  }
+
+  console.log('\n=====================================');
+  console.log('Test Summary');
+  console.log('=====================================');
+  console.log(`Passed: ${GREEN}${passed}${NC}`);
+  console.log(`Failed: ${RED}${failed}${NC}`);
+  console.log('=====================================');
+
+  process.exit(failed > 0 ? 1 : 0);
+}
+
+main();