Error loading global mcp json path: No such file or directory

## Steps to Reproduce
1. Start `kiro-cli chat` command
2. System displays error message: `2025-11-25T05:39:49.809661Z ERROR chat_cli::cli::agent: 984: Error loading global mcp json path: No such file or directory (os error 2)`
3. Error occurs at `chat_cli::cli::agent:984`

## Actual Behavior
- Displays ERROR level log message
- However, `~/.kiro/mcp.json` file exists and contains valid content: `{"mcpServers": {}, "version": "1.0"}`
- `~/.kiro/settings/mcp.json` also exists
- `~/.kiro/agents/AmazonQ.json` configuration is complete and valid
- Program functionality works normally, but error message causes confusion

## Expected Behavior
- Program should correctly load `~/.kiro/mcp.json` configuration file
- Or if file doesn't exist, should automatically create default configuration
- Should not display ERROR level message when file actually exists and is valid

## Environment
- OS: macOS 15.5
- kiro-cli version: latest