Clarify validator parameter naming is correct

[Copilot]

Addressed bot feedback suggesting cls should be changed to self in Pydantic validators. After analysis, the current implementation is correct.

Analysis

Methods decorated with @unified_validator() use cls because:

• The decorator wraps functions with Pydantic's root_validator (v1) or model_validator (v2)
• Both are classmethod-style validators requiring cls as first parameter
• All six validators in the file follow this pattern consistently (lines 94, 135, 146, 161, 198, 267)

Changing to self would break the validators. No code changes needed.

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