feat(agent): unify MCP tools and adopt Responses delivery

Move project and host queries into native MCP with host-owned OAuth/context,
while retaining memory, skills, actions and publication plugins. Add nearby-model
queries and explicit chat/task/learning model defaults.

Adopt Responses HTTP/SSE and native steer/queue inbox delivery, preserving scoped
session ownership, pending input edits and investigation communication.

Disable local-provider discovery: Server /health allowed native vLLM to probe
/v1/models on port 8000. A native before/after regression prevents recurrence.

Validation: 170 focused Bun tests; service/plugin typechecks; native discovery,
provider-discovery and input-inbox smoke checks; no paid model inference.

src/routes/chat.ts

@@ -1,4 +1,4 @@
-import { Router } from "express";
+import { Router, type NextFunction, type Request, type Response } from "express";
 
 import { agentModelOptions, resolveDefaultModel } from "../chat/models.js";
 import { type ChatSessionBridge } from "../chat/sessionBridge.js";
@@ -7,9 +7,9 @@ import { type FrontendActionCoordinator } from "../frontendAction/coordinator.js
 import { frontendActionRegistryResponse } from "../frontendAction/registry.js";
 import { type LearningOrchestrator } from "../learning/orchestrator.js";
 import { type MemoryStore } from "../memory/store.js";
-import { type ResultReferenceResolver } from "../results/resolver.js";
 import { type OpencodeRuntimeAdapter } from "../runtime/opencode.js";
 import { type SessionMetadataStore } from "../sessions/metadataStore.js";
+import { SessionContextMismatchError } from "../sessions/metadataStore.js";
 import { type SessionTranscriptStore } from "../sessions/transcriptStore.js";
 import { type SessionUiStateStore } from "../sessions/uiStateStore.js";
 import { uiRegistryResponse } from "../uiEnvelope/registry.js";
@@ -23,13 +23,17 @@ import { registerChatInteractionRoutes } from "./chatInteractionRoutes.js";
 import { createChatRunState } from "./chatRunState.js";
 import { registerChatSessionRoutes } from "./chatSessionRoutes.js";
 import { registerChatStreamRoute } from "./chatStreamRoute.js";
+import { registerResponseInputRoutes } from "./response-input-routes.js";
 import { registerMcpStatusRoutes } from "./mcpRoutes.js";
+import { registerChatSuggestionRoutes } from "./chatSuggestionRoutes.js";
+import { registerAgentMessageRoutes } from "./agent-message-routes.js";
+import type { AgentMessageCoordinator } from "../chat/agent-message-coordinator.js";
 
 export type BuildChatRouterOptions = {
+  agentMessages?: AgentMessageCoordinator;
   frontendActionCoordinator: FrontendActionCoordinator;
   learningOrchestrator: LearningOrchestrator;
   memoryStore: MemoryStore;
-  resultReferenceResolver: ResultReferenceResolver;
   runtime: OpencodeRuntimeAdapter;
   sessionBridge: ChatSessionBridge;
   sessionMetadataStore: SessionMetadataStore;
@@ -44,12 +48,12 @@ export const buildChatRouter = (options: BuildChatRouterOptions) => {
     frontendActionCoordinator,
     learningOrchestrator,
     memoryStore,
-    resultReferenceResolver,
     runtime,
     sessionBridge,
     sessionMetadataStore,
     sessionTranscriptStore,
     sessionUiStateStore,
+    agentMessages,
   } = options;
   const chatRouter = Router();
   const { activeRuns, lastRunStatuses } = runState;
@@ -125,6 +129,7 @@ export const buildChatRouter = (options: BuildChatRouterOptions) => {
   });
 
   registerChatSessionRoutes(chatRouter, {
+    learningOrchestrator,
     frontendActionCoordinator,
     runState,
     runtime,
@@ -134,11 +139,12 @@ export const buildChatRouter = (options: BuildChatRouterOptions) => {
     sessionUiStateStore,
   });
   registerMcpStatusRoutes(chatRouter, { sessionMetadataStore, runtime });
+  registerChatSuggestionRoutes(chatRouter, runtime);
+  if (agentMessages) registerAgentMessageRoutes(chatRouter, { sessions: sessionMetadataStore, messages: agentMessages });
 
   registerChatAuxiliaryRoutes(chatRouter, {
     activeRuns,
     lastRunStatuses,
-    resultReferenceResolver,
     sessionBridge,
     sessionMetadataStore,
     sessionUiStateStore,
@@ -152,7 +158,9 @@ export const buildChatRouter = (options: BuildChatRouterOptions) => {
     sessionUiStateStore,
   });
 
+  registerResponseInputRoutes(chatRouter, { runtime, sessionMetadataStore, runState });
   registerChatStreamRoute(chatRouter, {
+    agentMessages,
     frontendActionCoordinator,
     learningOrchestrator,
     memoryStore,
@@ -164,5 +172,12 @@ export const buildChatRouter = (options: BuildChatRouterOptions) => {
     sessionUiStateStore,
   });
 
+  chatRouter.use((error: unknown, _req: Request, res: Response, next: NextFunction) => {
+    if (error instanceof SessionContextMismatchError && !res.headersSent) {
+      res.status(404).json({ message: "session not found" });
+      return;
+    }
+    next(error);
+  });
   return chatRouter;
 };