Update .gitignore and bump version to 1.0.3

- Update GitHub workflow to use explicit DXT output filename
- Update Makefile package target to use version from manifest.json
- Eliminates dependency on directory name for consistent CI/local builds

- Add .pre-commit-config.yaml with ruff formatting, mypy type checking, and test validation
- Install pre-commit as dev dependency
- Fix all type annotations in test file
- Update chrome_management.py to use consistent cdp_client injection pattern
- Add pre-commit targets to Makefile
- Update README with pre-commit documentation
- All pre-commit hooks now pass: ruff, mypy, pytest

- Add .gitignore entries for .dxt files and documentation artifacts
- Bump version to 1.0.3 in manifest.json

Bump version to 1.0.2 - Fix DXT packaging with explicit version-based…

… filename

Bump version to 1.0.1