Add CLAUDE.md with critical git safety documentation and commit policy

CLAUDE.md

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+# Claude Memory and Instructions
+
+## CRITICAL GIT SAFETY LESSON
+
+### DEVASTATING MISTAKE COMMITTED:
+I made a catastrophic git error that destroyed user's work in progress:
+
+1. **What I did wrong**: Used `git add .` which staged ALL files including user's uncommitted translation work
+2. **The fatal mistake**: When trying to fix the staging issue, I used `git reset HEAD .` which overwrote the working directory files with staged versions
+3. **Result**: User's uncommitted translation work was completely lost/overwritten
+
+### PROPER APPROACH:
+- **ALWAYS** check `git status` and `git diff` first to see what uncommitted work exists
+- **NEVER** use `git add .` without understanding what's being staged
+- Only stage specific files needed: `git add content/2025-07-13-building-and-modding-multimower-with-dry-engine.rst`
+- If I need to unstage, use `git restore --staged <file>` for specific files, **NOT** `git reset HEAD .`
+
+### KEY LESSON:
+Git operations can be destructive to uncommitted work. Always preserve user's work in progress before any git commands.
+
+**This was a serious failure that cost the user their translation work. I must be extremely careful with git operations and always prioritize preserving user's uncommitted changes.**
+
+## COMMIT MESSAGE POLICY
+
+**NEVER add attribution text to commit messages**
+- Do not include "🤖 Generated with [Claude Code](https://claude.ai/code)"
+- Do not include "Co-Authored-By: Claude <noreply@anthropic.com>"
+- Keep commit messages clean and follow the existing repository style