Add field-level validation for all string fields

[enaboapps]

Summary

• Add check_str helper for consistent string length validation
• Validate all string fields on LogEntry: user_id, session_id, request_id, error_name, error_stack, flow_id, dataset, ip_address, country
• Existing message, tags, and step_index validation unchanged

Closes #5

Test plan

• Verify each field rejects values exceeding its max length
• Verify fields at or under the limit pass validation
• Verify existing log calls still work unchanged

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feature/field-validation-5

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