Add command-line interface for ActionKit API

[aaronelliotross]

Summary

This PR adds a comprehensive command-line interface (CLI) for the ActionKit API, making it easy to perform CRUD operations directly from the terminal.

Features

• Intuitive command structure: actionkit [METHOD] RESOURCE [PARAMS...]
• Full resource support: All ActionKit resources (users, donations, campaigns, petitions, transactions, etc.)
• Smart parameter parsing: Automatic type conversion for integers, booleans, floats, and null values
• Flexible authentication: Environment variables or CLI options
• Pretty output: JSON formatted by default, with --raw option for unformatted output
• Excellent discoverability: Helpful error messages list all available resources

Usage Examples

# Get a user by ID (method defaults to 'get')
actionkit users id=123

# Search users by email
actionkit search users email=test@example.com

# Create a new user
actionkit post users email=new@example.com first_name=John

# Update a user
actionkit patch users/123 first_name=Jane

# Delete a user
actionkit delete users/123

Files Changed

• actionkit/cli.py (new): Complete CLI implementation using Click framework
• setup.py: Added click>=8.0 dependency and console_scripts entry point
• actionkit/users.py: Fixed regex pattern to use raw string (bug fix)
• CLAUDE.md (new): Documentation for future Claude Code sessions
• CLI_USAGE.md (new): Comprehensive usage guide with examples

Test Plan

• CLI installs correctly via pip install -e .
• Help command displays proper usage: actionkit --help
• Unknown resources display helpful error with full resource list
• Parameter parsing handles various types correctly
• Integration test with actual ActionKit instance (requires credentials)

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