test(doctor): update MCP checks for websearch_exa removal

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src/cli/doctor/checks/mcp.ts

@@ -5,7 +5,7 @@ import type { CheckResult, CheckDefinition, McpServerInfo } from "../types"
 import { CHECK_IDS, CHECK_NAMES } from "../constants"
 import { parseJsonc } from "../../../shared"
 
-const BUILTIN_MCP_SERVERS = ["context7", "websearch_exa", "grep_app"]
+const BUILTIN_MCP_SERVERS = ["context7", "grep_app"]
 
 const MCP_CONFIG_PATHS = [
   join(homedir(), ".claude", ".mcp.json"),