feat: prepare project for PyPI distribution

[johnlarkin1]

Important

This PR was created by Claude Code. Take an extra sec to review. Or don't and trust the robots and process.

Summary

Prepares the project for distribution via PyPI, pipx, and uvx.

Motivation & Context

The project needs to be installable via standard Python package managers so users can simply run pip install imessage-data-foundry or uvx imessage-data-foundry.

Key Changes

• Add MIT LICENSE file (required for PyPI)
• Fix pyproject.toml: move dev deps out of main deps, enable dynamic versioning from __init__.py
• Add CLI argument parsing with --help, --version, --output flags
• Update README with installation methods (pip, pipx, uvx, from source)
• Add GitHub Actions workflows:
  • ci.yaml: lint, type check, tests on PRs
  • cd.yaml: build and publish to PyPI on version tags

Critical Files Touched

• LICENSE (new)
• pyproject.toml - dependency fixes, dynamic versioning
• imessage_data_foundry/cli/app.py - argparse CLI
• README.md - installation docs
• .github/workflows/ci.yaml (new)
• .github/workflows/cd.yaml (new)

How to Test

make lint   # All checks pass
make test   # 370 tests pass
imessage-data-foundry --version  # Shows 0.1.0
imessage-data-foundry --help     # Shows usage

Additional Notes to Human Reviewer

After merge, to release:

1. Set up PyPI trusted publishing (workflow: cd.yaml)
2. Tag and push: git tag v0.1.0 && git push origin v0.1.0

Co-authored-by: Claude Code noreply@anthropic.com