Document APPROVALTESTS_CONFIG for viewing test diffs

[nitsanavni]

Summary

• Documented the APPROVALTESTS_CONFIG environment variable for viewing approval test diffs directly in terminal
• Added to CLAUDE.md for future reference during development

Useful Command

APPROVALTESTS_CONFIG='{"reporter":"PythonNativeReporter"}' uv run python -m pytest tests/path/to/test.py -v -s

Benefits

• See approval test diffs directly in terminal output
• No need to manually check received files
• Faster development workflow for approval tests
• Uses PythonNativeReporter instead of external diff tools

This was discovered while working on the DateScrubber improvements and proved very useful for debugging approval test failures.

🤖 Generated with Claude Code

Summary by Sourcery

Add a new CLAUDE.md file with developer notes covering test & type-checking commands, code style guidelines, MyPy configuration, and instructions for using the APPROVALTESTS_CONFIG environment variable to view approval test diffs directly in the terminal.

Documentation:

• Introduce CLAUDE.md with development setup and workflow instructions.
• Document the APPROVALTESTS_CONFIG environment variable for in-terminal approval test diffs.

[sourcery-ai]

Reviewer's Guide

This PR introduces a new CLAUDE.md file containing developer-facing notes—test runs, type checking, code style—and specifically documents the APPROVALTESTS_CONFIG environment variable for viewing approval test diffs directly in the terminal.

File-Level Changes

Change	Details	Files
Add CLAUDE.md with development notes	Create CLAUDE.md as a new reference for developer workflows Include sections on running tests, type checking, and code style	CLAUDE.md
Document APPROVALTESTS_CONFIG for in-terminal diffs	Add 'Approval Tests' section with command snippet Show how to set APPROVALTESTS_CONFIG to use PythonNativeReporter	CLAUDE.md

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[sourcery-ai]

Hey @nitsanavni - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

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