Wire IAgentConfigurationService into production agent host DI

PluginController now requires IAgentConfigurationService in its
constructor. agentHostServerMain.ts and agentHostMain.ts both
construct CopilotAgent via DI but didn't register the service,
causing the integration test 'Agent Host Server starts with
production agent services registered' to fail because the server
exited prematurely on startup.

Expose configurationService getter on AgentService and register
it in the downstream DI containers.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: joshspicer

src/vs/platform/agentHost/node/agentHostMain.ts

@@ -17,6 +17,7 @@ import * as os from 'os';
 import * as inspector from 'inspector';
 import { AgentHostIpcChannels, IAgentHostInspectInfo, IAgentHostSocketInfo, IConnectionTrackerService } from '../common/agentService.js';
 import { AgentService } from './agentService.js';
+import { IAgentConfigurationService } from './agentConfigurationService.js';
 import { IAgentHostTerminalManager } from './agentHostTerminalManager.js';
 import { CopilotAgent } from './copilot/copilotAgent.js';
 import { ProtocolServerHandler } from './protocolServerHandler.js';
@@ -103,6 +104,7 @@ function startAgentHost(): void {
 		diServices.set(IDiffComputeService, diffComputeService);
 
 		diServices.set(IAgentHostTerminalManager, agentService.terminalManager);
+		diServices.set(IAgentConfigurationService, agentService.configurationService);
 		const instantiationService = new InstantiationService(diServices);
 		diServices.set(IAgentHostGitService, instantiationService.createInstance(AgentHostGitService));
 		agentService.registerProvider(instantiationService.createInstance(CopilotAgent));

src/vs/platform/agentHost/node/agentHostServerMain.ts

@@ -33,6 +33,7 @@ import { InstantiationService } from '../../instantiation/common/instantiationSe
 import { ServiceCollection } from '../../instantiation/common/serviceCollection.js';
 import { CopilotAgent } from './copilot/copilotAgent.js';
 import { AgentService } from './agentService.js';
+import { IAgentConfigurationService } from './agentConfigurationService.js';
 import { IAgentHostTerminalManager } from './agentHostTerminalManager.js';
 import { WebSocketProtocolServer } from './webSocketTransport.js';
 import { ProtocolServerHandler } from './protocolServerHandler.js';
@@ -181,6 +182,7 @@ async function main(): Promise<void> {
 		diServices.set(IAgentPluginManager, pluginManager);
 		diServices.set(IDiffComputeService, disposables.add(new NodeWorkerDiffComputeService(logService)));
 		diServices.set(IAgentHostTerminalManager, agentService.terminalManager);
+		diServices.set(IAgentConfigurationService, agentService.configurationService);
 		const instantiationService = new InstantiationService(diServices);
 		diServices.set(IAgentHostGitService, instantiationService.createInstance(AgentHostGitService));
 		const copilotAgent = disposables.add(instantiationService.createInstance(CopilotAgent));

src/vs/platform/agentHost/node/agentService.ts

@@ -65,6 +65,9 @@ export class AgentService extends Disposable implements IAgentService {
 	/** Exposes the state manager for co-hosting a WebSocket protocol server. */
 	get stateManager(): AgentHostStateManager { return this._stateManager; }
 
+	/** Exposes the configuration service so agent providers can share root config plumbing. */
+	get configurationService(): IAgentConfigurationService { return this._configurationService; }
+
 	/** Registered providers keyed by their {@link AgentProvider} id. */
 	private readonly _providers = new Map<AgentProvider, IAgent>();
 	/** Maps each active session URI (toString) to its owning provider. */