chore: fix duplicate package.json field, update gitignore and docs

[brawlaphant]

Summary

• package.json: Remove duplicate "type": "module" field (appeared on both line 4 and line 6)
• .gitignore: Add Python (__pycache__/, *.pyc, *.pyo, .venv/, *.egg-info/, dist/, build/) and Rust/CosmWasm (target/, *.wasm) patterns in preparation for PR feat: cadCAD economic simulations for M012-M015 parameter validation #58 cadCAD simulation code
• README.md: Replace placeholder license section with Apache 2.0 (code) + CC BY-SA 4.0 (docs) links
• docs/DEV_SETUP.md: Add verify:m010:datasets npm script to the table; add M012, M013, M015 reference implementation self-test examples

Test plan

• node scripts/verify.mjs still passes
• npm run verify:m010:datasets runs correctly
• Confirm package.json parses without errors (node -e "require('./package.json')" or JSON.parse)
• Verify .gitignore patterns exclude expected files

🤖 Generated with Claude Code

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on repository maintenance and developer experience improvements. It addresses minor configuration issues, enhances the .gitignore file to support upcoming Python and Rust/CosmWasm development, and updates documentation to provide clearer licensing details and more comprehensive setup instructions for running various mechanism self-tests. These changes streamline the development workflow and prepare the project for broader language support.

Highlights

• Configuration Fix: Removed a duplicate 'type' field in package.json to ensure correct parsing and avoid redundancy.
• Development Environment Setup: Updated .gitignore to include common Python and Rust/CosmWasm build artifacts, preparing the repository for future multi-language development.
• Documentation Updates: Clarified licensing information in README.md, specifying Apache 2.0 for code and CC BY-SA 4.0 for documentation. Also, added a new npm script and self-test examples for M012, M013, and M015 mechanisms in DEV_SETUP.md.

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[gemini-code-assist]

Code Review

This pull request updates the .gitignore file to include Python and Rust/CosmWasm build artifacts, clarifies licensing details in README.md, and enhances docs/DEV_SETUP.md with a new verification script for M010 datasets and instructions for running self-tests for M012, M013, and M015 mechanisms. A review comment highlights a duplicate 'type': 'module' field in package.json that should be removed to maintain valid JSON.

[gemini-code-assist]

The package.json file contains a duplicate "type": "module" field. While some parsers might be lenient, having duplicate keys in a JSON object is invalid and can lead to unpredictable behavior. Removing the duplicate entry ensures the file is well-formed and correctly parsed.

[brawlaphant]

Thanks for flagging — this PR is the fix for that exact issue. The diff shows the duplicate "type": "module" being removed (the - line). After this PR merges, package.json will have exactly one "type": "module" field on line 4.