feat: LLM provider configuration, secret store, and setup wizard

Add secure credential storage (GNOME Keyring + file fallback),
LLM provider config in ~/.mcpctl/config.json, interactive setup
wizard (mcpctl config setup), and wire configured provider into
mcplocal for smart pagination summaries.

- Secret store: SecretStore interface, GnomeKeyringStore, FileSecretStore
- Config schema: LlmConfigSchema with provider/model/url/binaryPath
- Setup wizard: arrow-key provider/model selection, dynamic model fetch
- Provider factory: creates ProviderRegistry from config + secrets
- Status: shows LLM line with hint when not configured
- 572 tests passing across all packages

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

src/cli/tests/commands/status.test.ts

@@ -126,4 +126,69 @@ describe('status command', () => {
     expect(output.join('\n')).toContain('official');
     expect(output.join('\n')).not.toContain('glama');
   });
+
+  it('shows LLM not configured hint when no LLM is set', async () => {
+    const cmd = createStatusCommand({
+      configDeps: { configDir: tempDir },
+      credentialsDeps: { configDir: tempDir },
+      log,
+      checkHealth: async () => true,
+    });
+    await cmd.parseAsync([], { from: 'user' });
+    const out = output.join('\n');
+    expect(out).toContain('LLM:');
+    expect(out).toContain('not configured');
+    expect(out).toContain('mcpctl config setup');
+  });
+
+  it('shows configured LLM provider and model', async () => {
+    saveConfig({ ...DEFAULT_CONFIG, llm: { provider: 'anthropic', model: 'claude-haiku-3-5-20241022' } }, { configDir: tempDir });
+    const cmd = createStatusCommand({
+      configDeps: { configDir: tempDir },
+      credentialsDeps: { configDir: tempDir },
+      log,
+      checkHealth: async () => true,
+    });
+    await cmd.parseAsync([], { from: 'user' });
+    const out = output.join('\n');
+    expect(out).toContain('LLM:');
+    expect(out).toContain('anthropic / claude-haiku-3-5-20241022');
+  });
+
+  it('shows not configured when LLM provider is none', async () => {
+    saveConfig({ ...DEFAULT_CONFIG, llm: { provider: 'none' } }, { configDir: tempDir });
+    const cmd = createStatusCommand({
+      configDeps: { configDir: tempDir },
+      credentialsDeps: { configDir: tempDir },
+      log,
+      checkHealth: async () => true,
+    });
+    await cmd.parseAsync([], { from: 'user' });
+    expect(output.join('\n')).toContain('not configured');
+  });
+
+  it('includes llm field in JSON output', async () => {
+    saveConfig({ ...DEFAULT_CONFIG, llm: { provider: 'gemini-cli', model: 'gemini-2.5-flash' } }, { configDir: tempDir });
+    const cmd = createStatusCommand({
+      configDeps: { configDir: tempDir },
+      credentialsDeps: { configDir: tempDir },
+      log,
+      checkHealth: async () => true,
+    });
+    await cmd.parseAsync(['-o', 'json'], { from: 'user' });
+    const parsed = JSON.parse(output[0]) as Record<string, unknown>;
+    expect(parsed['llm']).toBe('gemini-cli / gemini-2.5-flash');
+  });
+
+  it('includes null llm in JSON output when not configured', async () => {
+    const cmd = createStatusCommand({
+      configDeps: { configDir: tempDir },
+      credentialsDeps: { configDir: tempDir },
+      log,
+      checkHealth: async () => true,
+    });
+    await cmd.parseAsync(['-o', 'json'], { from: 'user' });
+    const parsed = JSON.parse(output[0]) as Record<string, unknown>;
+    expect(parsed['llm']).toBeNull();
+  });
 });