Migrate to ruff/mypy and add GitHub Actions CI/CD

[jeremyeder]

Summary

This PR modernizes the development toolchain and adds automated CI/CD pipelines:

• Linting: Migrates from black/isort/flake8 to unified ruff (57% faster)
• Type Checking: Adds mypy with strict type safety enforcement
• CI Pipeline: GitHub Actions workflow for automated testing and quality checks
• Release Pipeline: GitHub Actions workflow for automated PyPI publishing
• Python Support: Updates to Python 3.12 only (drops 3.10, 3.11)
• Optimizations: Uses official uv action with dependency caching

Changes

New Files

• .github/workflows/ci.yml - CI pipeline (lint, type check, test, coverage)
• .github/workflows/release.yml - Release pipeline (build, publish to PyPI)

Modified Files

• pyproject.toml - Ruff/mypy config, Python 3.12 requirement, coverage path fix
• CLAUDE.md - Updated development commands and workflow
• .gitignore - Added artifacts/ directory

Key Improvements

Development Experience:

• Single tool (ruff) replaces three (black, isort, flake8)
• Faster linting: ~57% improvement over previous toolchain
• Type safety enforced via mypy with strict settings
• Consistent commands via uv run pattern

CI/CD:

• Automated testing on every PR/push to main
• Code coverage reporting to Codecov
• Automated PyPI releases via trusted publishing
• Dependency caching for faster CI runs (30-50% faster)

Architecture Fixes:

• Fixed coverage path inconsistency (CI vs local)
• Removed redundant config defaults (ruff.format)
• Proper virtual environment management in CI

Test Plan

• Verified ruff linting passes locally
• Verified mypy type checking passes (codebase fully typed)
• Verified pytest runs successfully
• Validated GitHub Actions workflow syntax
• Confirmed coverage path consistency
• Architecture review completed (no issues)

Migration Notes

For developers, new commands are:

# One-time setup
uv venv
uv pip install -e ".[dev]"

# Pre-commit workflow
uv run ruff format . && uv run ruff check . && uv run mypy src/mcp_acp && uv run pytest tests/

# Individual commands
uv run ruff format .              # Format code
uv run ruff check . --fix         # Lint with auto-fix
uv run mypy src/mcp_acp           # Type check
uv run pytest tests/              # Test

Old commands no longer needed:

• black .
• isort .
• flake8 . --ignore=E501,E203,W503

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