feat: implement v2 3-tier architecture (mcpctl → mcplocal → mcpd)

- Rename local-proxy to mcplocal with HTTP server, LLM pipeline, mcpd discovery
- Add LLM pre-processing: token estimation, filter cache, metrics, Gemini CLI + DeepSeek providers
- Add mcpd auth (login/logout) and MCP proxy endpoints
- Update CLI: dual URLs (mcplocalUrl/mcpdUrl), auth commands, --direct flag
- Add tiered health monitoring, shell completions, e2e integration tests
- 57 test files, 597 tests passing

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

src/cli/tests/auth/credentials.test.ts

@@ -0,0 +1,59 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { mkdtempSync, rmSync, statSync, existsSync } from 'node:fs';
+import { join } from 'node:path';
+import { tmpdir } from 'node:os';
+import { saveCredentials, loadCredentials, deleteCredentials } from '../../src/auth/index.js';
+
+let tempDir: string;
+
+beforeEach(() => {
+  tempDir = mkdtempSync(join(tmpdir(), 'mcpctl-auth-test-'));
+});
+
+afterEach(() => {
+  rmSync(tempDir, { recursive: true, force: true });
+});
+
+describe('saveCredentials', () => {
+  it('saves credentials file', () => {
+    saveCredentials({ token: 'tok123', mcpdUrl: 'http://x:3100', user: 'alice@test.com' }, { configDir: tempDir });
+    expect(existsSync(join(tempDir, 'credentials'))).toBe(true);
+  });
+
+  it('sets 0600 permissions', () => {
+    saveCredentials({ token: 'tok123', mcpdUrl: 'http://x:3100', user: 'alice@test.com' }, { configDir: tempDir });
+    const stat = statSync(join(tempDir, 'credentials'));
+    expect(stat.mode & 0o777).toBe(0o600);
+  });
+
+  it('creates config dir if missing', () => {
+    const nested = join(tempDir, 'sub', 'dir');
+    saveCredentials({ token: 'tok', mcpdUrl: 'http://x:3100', user: 'bob' }, { configDir: nested });
+    expect(existsSync(join(nested, 'credentials'))).toBe(true);
+  });
+});
+
+describe('loadCredentials', () => {
+  it('returns null when no credentials file', () => {
+    expect(loadCredentials({ configDir: tempDir })).toBeNull();
+  });
+
+  it('round-trips credentials', () => {
+    const creds = { token: 'tok456', mcpdUrl: 'http://remote:3100', user: 'charlie@test.com', expiresAt: '2099-01-01' };
+    saveCredentials(creds, { configDir: tempDir });
+    const loaded = loadCredentials({ configDir: tempDir });
+    expect(loaded).toEqual(creds);
+  });
+});
+
+describe('deleteCredentials', () => {
+  it('returns false when no credentials file', () => {
+    expect(deleteCredentials({ configDir: tempDir })).toBe(false);
+  });
+
+  it('deletes credentials file', () => {
+    saveCredentials({ token: 'tok', mcpdUrl: 'http://x:3100', user: 'u' }, { configDir: tempDir });
+    expect(deleteCredentials({ configDir: tempDir })).toBe(true);
+    expect(existsSync(join(tempDir, 'credentials'))).toBe(false);
+  });
+});