[BUG] MCP is broken ENOENT on MacOS

Environment

• Platform (select one):
• [x] Anthropic API
• [ ] AWS Bedrock
• [ ] Google Vertex AI
• [ ] Other: <!-- specify -->
• Claude CLI version: 1.0.83
• Operating System: macOS 15.6
• Terminal: Alactritty

Bug Description

No MCP works, always ENOENT

Steps to Reproduce

1. Add any MCP
2. Run claude --debug

Expected Behavior

MCP works

Actual Behavior

ENOENT

Additional Context

[DEBUG] MCP server "test": Connection failed: Error: spawn echo 'Hello World' ENOENT
[DEBUG] MCP server "test": Error message: spawn echo 'Hello World' ENOENT
[DEBUG] MCP server "test": Error stack: Error: spawn echo 'Hello World' ENOENT
    at ChildProcess._handle.onexit (node:internal/child_process:286:19)
    at onErrorNT (node:internal/child_process:484:16)
    at process.processTicksAndRejections (node:internal/process/task_queues:90:21)

{
  "mcpServers": {
    "test": {
      "type": "stdio",
      "command": "echo 'Hello World'",
      "args": [],
      "env": {}
    }
  }
}