* Tool Guardian Hook
Add Tool Guardian hook for blocking dangerous tool operations
Introduces a preToolUse hook that scans Copilot agent tool invocations
against ~20 threat patterns (destructive file ops, force pushes, DB drops,
permission abuse, network exfiltration) and blocks or warns before execution.
* Address review feedback: move hook to .github/, remove accidental log file
- Move hooks/tool-guardian/ to .github/hooks/tool-guardian/
- Remove accidentally committed guard.log
- Update all path references in README.md
* Move log directory to .github/, revert hook files back to
hooks/
- Revert hook files from .github/hooks/ back to hooks/tool-guardian/
- Update default log path to .github/logs/copilot/tool-guardian/
- Update all path references in README.md and hooks.json
