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feat(tools): implement ExistenceTool for file/folder existence checks

Adds ExistenceTool for checking if files or folders exist with security hardening:
- Structured JSON output with exists, type, and path fields
- Symlink rejection to prevent path traversal attacks
- PathGuardrail integration for path containment validation
- Generic error messages to prevent information disclosure
- Expanded default blocked patterns (3 to 13)
- Updated ToolResult type to support structured results
- Added 28 comprehensive unit tests

🤖 Implemented together with a coding agent.

716 of 876 branches covered (81.74%)

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