Copy mutable defaults during normalization

[njzjz-bot]

Summary

• deep-copy schema defaults before inserting them into normalized data
• protect nested mutable defaults from leaking across calls
• add list and mapping regression coverage

Fixes #114.

Validation

• python -m unittest -v tests.test_normalizer
• Ruff checks on changed files

AI attribution

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

[coderabbitai]

Important

• 🔍 Trigger review

This repository does not receive automatic reviews because it has fewer than 10 stars.

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 405c35b4-dd7b-4c1a-af6d-482fbc40cb75

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[njzjz-bot]

Review result: no blocking issues found.

Deep-copying non-sentinel defaults prevents both direct and nested mutable state from leaking into the schema or later normalization results, while preserving the special empty-dict population behavior. The focused normalizer suite passes (8/8), and CI is green.

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh