Initial commit - Stage 1 working version

Saving current working state before proceeding to Stage 2.
Includes:
- Backend: Python-based QC validator with shapefile processing
- Frontend: Drag-and-drop file upload interface
- Sample files for testing
- Documentation and revision history

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,23 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+env/
+venv/
+ENV/
+
+# Logs
+*.log
+
+# Temporary files
+temp/
+*.tmp
+
+# Archives (keeping original samplefiles directory)
+*.zip
+
+# OS files
+.DS_Store
+Thumbs.db