Feature Request: Display syntax errors for .claude/setting.json and GitHub Actions workflows

## Description

**Problem:** When running Claude Code Action, syntax errors in configuration files are silently ignored. Users get no error messages, making it hard to debug issues.

**Request:** Please add syntax error detection and display for:
1. `.claude/setting.json`
2. GitHub Actions workflow syntax (especially in Claude Code Action specific fields)

## Examples

### GitHub Actions Workflow

Currently no error shown for:

```yaml
allowed_tools: |
- 'Bash(pnpm install)'
- 'Bash(pnpm test)'
- 'Bash(pnpm build)'
- 'Bash(pnpm lint)'
```

Expected error message:

```
Error: Invalid syntax in 'allowed_tools'. Remove hyphens (-) when using pipe (|) notation.
Correct format:
allowed_tools: |
'Bash(pnpm install)'
'Bash(pnpm test)'
```

### `.claude/setting.json`
Currently no error shown for invalid JSON syntax.

Expected: Clear error messages with line numbers for JSON syntax errors.

**Benefits:**
- Faster debugging
- Better developer experience
- Prevents silent failures