docs: add safe permissions configuration guide

[ajjucoder]

Summary

This PR adds a new documentation file (SAFE_PERMISSIONS.md) that provides a recommended settings.json configuration for enabling bypass mode while maintaining safety guardrails.

Problem

Claude Code's default permission system asks for confirmation on every command, slowing down development. The --dangerously-skip-permissions flag removes ALL safety checks, which is risky.

Solution

This guide provides a balanced approach:

• Enables bypass mode for faster workflows
• Maintains a deny list that blocks dangerous operations
• Protects sensitive files from being read

What's Blocked

• Destructive commands: rm -rf /, sudo rm -rf, mkfs
• System control: sudo shutdown, sudo reboot
• Dangerous git: git push --force origin main
• Sensitive files: .env, SSH keys, credentials

What's Allowed

100+ safe development commands run without prompts:

• File operations, git, package managers
• Language runtimes, DevOps tools

Related

• Original implementation: https://github.com/ajjucoder/claude-code-safe-bypass