feat: add get and describe commands with API client

kubectl-style get (table/json/yaml) and describe commands for servers,
profiles, projects, instances. ApiClient for daemon communication.
118 CLI tests passing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli/tests/api-client.test.ts

@@ -0,0 +1,77 @@
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import http from 'node:http';
+import { ApiClient, ApiError } from '../src/api-client.js';
+
+let server: http.Server;
+let port: number;
+
+beforeAll(async () => {
+  server = http.createServer((req, res) => {
+    if (req.url === '/api/v1/servers' && req.method === 'GET') {
+      res.writeHead(200, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify([{ id: 'srv-1', name: 'slack' }]));
+    } else if (req.url === '/api/v1/servers/srv-1' && req.method === 'GET') {
+      res.writeHead(200, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ id: 'srv-1', name: 'slack', transport: 'STDIO' }));
+    } else if (req.url === '/api/v1/servers' && req.method === 'POST') {
+      const chunks: Buffer[] = [];
+      req.on('data', (c: Buffer) => chunks.push(c));
+      req.on('end', () => {
+        const body = JSON.parse(Buffer.concat(chunks).toString());
+        res.writeHead(201, { 'Content-Type': 'application/json' });
+        res.end(JSON.stringify({ id: 'srv-new', ...body }));
+      });
+    } else if (req.url === '/api/v1/missing' && req.method === 'GET') {
+      res.writeHead(404, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ error: 'Not found' }));
+    } else {
+      res.writeHead(404);
+      res.end();
+    }
+  });
+
+  await new Promise<void>((resolve) => {
+    server.listen(0, () => {
+      const addr = server.address();
+      if (addr && typeof addr === 'object') {
+        port = addr.port;
+      }
+      resolve();
+    });
+  });
+});
+
+afterAll(() => {
+  server.close();
+});
+
+describe('ApiClient', () => {
+  it('performs GET request for list', async () => {
+    const client = new ApiClient({ baseUrl: `http://localhost:${port}` });
+    const result = await client.get<Array<{ id: string; name: string }>>('/api/v1/servers');
+    expect(result).toEqual([{ id: 'srv-1', name: 'slack' }]);
+  });
+
+  it('performs GET request for single item', async () => {
+    const client = new ApiClient({ baseUrl: `http://localhost:${port}` });
+    const result = await client.get<{ id: string; name: string }>('/api/v1/servers/srv-1');
+    expect(result.name).toBe('slack');
+  });
+
+  it('performs POST request', async () => {
+    const client = new ApiClient({ baseUrl: `http://localhost:${port}` });
+    const result = await client.post<{ id: string; name: string }>('/api/v1/servers', { name: 'github' });
+    expect(result.id).toBe('srv-new');
+    expect(result.name).toBe('github');
+  });
+
+  it('throws ApiError on 404', async () => {
+    const client = new ApiClient({ baseUrl: `http://localhost:${port}` });
+    await expect(client.get('/api/v1/missing')).rejects.toThrow(ApiError);
+  });
+
+  it('throws on connection error', async () => {
+    const client = new ApiClient({ baseUrl: 'http://localhost:1' });
+    await expect(client.get('/anything')).rejects.toThrow();
+  });
+});