Validate root values in check_value

[njzjz-bot]

Summary

• validate the root dtype before traversing child fields
• run root extra_check callbacks and preserve structured dargs errors
• add regression coverage for root type and value failures

Fixes #113.

Validation

• python -m unittest -v tests.test_checker
• 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

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 4f9719f5-33bb-4a60-ac52-eff18a3aa97a

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[njzjz-bot]

Review result: no blocking issues found.

The root-value validation now applies _check_data before descendant traversal, matching the behavior of wrapped check() calls while preserving the existing path reporting. I reviewed the regression coverage and confirmed the focused checker suite passes (6/6); the PR's CI checks are also green.

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