Add maxpylang setup-claude CLI command

[chrishyoroklee]

Summary

Adds a CLI command that ships a CLAUDE.md template with the package, so users can set up deterministic Claude Code instructions in one step.

Why

After our YouTube videos gained traction, users asked a valid question: how does Claude "know" to use MaxPyLang?

Currently, Claude's discovery of the MaxPyLang API is heuristic — it may or may not read the __init__.py docstring, explore source files, or rely on training data. This is non-deterministic and sometimes leads to incorrect API usage.

CLAUDE.md solves this because Claude Code automatically loads it on every session start — no guessing, no exploration. It's also prompt-cached, meaning those tokens cost 90% less than a skill file or agent self-discovery.

We considered two approaches:

Approach	Deterministic?	Token cost	Setup
__init__.py docstring (current)	No — agent must choose to read it	Full price	None
CLAUDE.md (this PR)	Yes — always loaded	90% cheaper (cached)	One command
Skill .md	Yes, when invoked	Full price	Install to ~/.claude/skills/

CLAUDE.md was the best tradeoff: deterministic, cheapest on tokens, and simple to set up.

New user flow

# 1. Install (same as before)
pip install maxpylang

# 2. Set up Claude Code support (one-time, per project)
cd my_project
maxpylang setup-claude
# → "Created /path/to/my_project/CLAUDE.md"

# 3. Just prompt naturally — no need to say "use maxpylang"
# Claude already has the full API guide loaded.

If CLAUDE.md already exists, the command warns and exits. Use --force to overwrite:

maxpylang setup-claude         # → "CLAUDE.md already exists. Use --force to overwrite."
maxpylang setup-claude --force # → overwrites

What changed

• maxpylang/data/CLAUDE_TEMPLATE.md (new) — The template CLAUDE.md containing the full MaxPyLang API guide. Ships inside the pip package automatically via existing MANIFEST.in coverage.
• maxpylang/cli.py (new) — Minimal CLI using argparse. setup-claude subcommand copies the template to ./CLAUDE.md. Includes error handling for permissions issues and missing template files.
• pyproject.toml — Added [project.scripts] entry point: maxpylang = "maxpylang.cli:main"

Test plan

• pip install -e . to register the console script
• maxpylang with no args prints help
• maxpylang setup-claude creates ./CLAUDE.md with correct content
• Running it again warns "already exists"
• maxpylang setup-claude --force overwrites
• Open Claude Code in the directory — confirm CLAUDE.md is loaded and Claude knows the MaxPyLang API without being told