Refactor error handling and schema validation workflows

[Splatcrafter]

Summary

Improved error handling and state consistency through refactoring of diagnostics, TOML/JSON/YAML processing, and schema validation components.

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring
• Documentation
• Build / CI

Related Issues

Closes #145, #146, #149, #151, #153, #154, #155, #156, #157, #160

Changes

• Refactored diagnostics handling for clearer error reporting.
• Streamlined TOML/JSON/YAML data processing.
• Enhanced schema validation logic for improved stability and maintainability.

Verification

• Unit tests added/updated
• Existing tests pass
• Manual verification performed (if applicable)

Breaking Changes

No breaking changes introduced.

Checklist

• Code follows project conventions
• Public APIs are documented
• Tests cover new behavior
• No unnecessary dependencies added

[github-actions]

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Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA 54ae1e5.

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Scanned Files

None