chore: update GIT PROTOCOL section to reflect Linux native approach

Replaced macOS-specific hardcoded path mandate with cross-platform git fallback mechanism using system PATH.

AI_RULES.md

@@ -15,7 +15,7 @@ This is the **Single Source of Truth** for ALL AI agents. Refer to [PROJECT_ARCH
 
 ## 2. ENGINEERING & OPERATIONAL LAWS
 - **ENGLISH ONLY**: Interfaces, code, variables, and docs MUST be in English. Translate any Romanian text found in code immediately. (User conversation: Romanian/English).
-- **GIT PROTOCOL**: Use the direct binary path `/Library/Developer/CommandLineTools/usr/bin/git`) for ALL Git operations. **DO NOT REMOVE OR CHANGE THIS PATH UNDER ANY CIRCUMSTANCES!** Never push or use `--force` unless explicitly asked. Branching: `master` (stable), `dev` (active), `vX` (archive).
+- **GIT PROTOCOL**: Use `git` command from system PATH for all operations. On Linux, this is provided by the git package manager. Git operations use the fallback mechanism in `.git_path` file for cross-platform compatibility. Never push or use `--force` unless explicitly asked. Branching: `master` (stable), `dev` (active), `vX` (archive).
 - **VERSIONING**: Update `VERSION.json` on every commit. Use `scripts/save_version.py` for automated releases.
 - **DEPENDENCIES**: Update `backend/requirements.txt` with version constraints for every new pip package.
 - **SSOT INTEGRITY**: Every feature change MUST update: `README.md`, `USER_GUIDE.md`, `PROJECT_ARCHITECTURE.md`, and `export_prod.sh`.