Add pre-commit hooks for code quality and error prevention

Includes:
- check-ast: Validates Python syntax before commit
- Ruff: Ultra-fast linting and formatting
- Black: Code formatting
- YAML/JSON syntax checking
- Debug statement detection
- Merge conflict detection

To use:
1. pip install pre-commit
2. pre-commit install
3. Commits will now automatically check code quality

.pre-commit-config.yaml

@@ -0,0 +1,46 @@
+# Pre-commit hooks configuration
+# Install: pip install pre-commit && pre-commit install
+# Run manually: pre-commit run --all-files
+
+repos:
+  # Python syntax checking
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.5.0
+    hooks:
+      - id: check-ast
+        name: Check Python AST
+        description: Validates Python syntax before commit
+      - id: check-yaml
+        name: Check YAML syntax
+      - id: check-json
+        name: Check JSON syntax
+      - id: end-of-file-fixer
+        name: Fix end of files
+      - id: trailing-whitespace
+        name: Trim trailing whitespace
+      - id: check-added-large-files
+        name: Check for large files
+        args: ['--maxkb=500']
+      - id: check-merge-conflict
+        name: Check for merge conflicts
+      - id: debug-statements
+        name: Check for debug statements
+  
+  # Python code formatting
+  - repo: https://github.com/psf/black
+    rev: 23.12.1
+    hooks:
+      - id: black
+        name: Format with Black
+        language_version: python3
+        args: ['--line-length=100']
+  
+  # Python linting with Ruff (ultra-fast)
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.1.9
+    hooks:
+      - id: ruff
+        name: Lint with Ruff
+        args: ['--fix', '--exit-non-zero-on-fix']
+      - id: ruff-format
+        name: Format with Ruff