Align MCP/CLI naming and resolve default model/mode server-side (#291)

* Align create_agent naming and resolve defaults server-side

* Fix test assertions for default model/mode resolution

- Use config.model and config.modeId instead of non-existent snapshot.model
- Strip legacy "default" model ID in normalizeConfig
- Update runtimeInfo assertion to expect resolved default model

* Fix CI: update CLI test for --title, fix formatting in checkout-git

packages/server/src/client/daemon-client.ts

@@ -71,7 +71,6 @@ import type {
   AgentSessionConfig,
 } from "../server/agent/agent-sdk-types.js";
 import type { MutableDaemonConfig, MutableDaemonConfigPatch } from "../shared/messages.js";
-import { getAgentProviderDefinition } from "../server/agent/provider-manifest.js";
 import { isRelayClientWebSocketUrl } from "../shared/daemon-endpoints.js";
 import {
   asUint8Array,
@@ -3938,10 +3937,6 @@ function resolveAgentConfig(options: CreateAgentRequestOptions): AgentSessionCon
     throw new Error("createAgent requires provider and cwd");
   }
 
-  if (!merged.modeId) {
-    merged.modeId = getAgentProviderDefinition(merged.provider).defaultModeId ?? undefined;
-  }
-
   return {
     ...merged,
     provider: merged.provider,