Refine parser size and proficiency logic

[wrightmat]

Summary

• derive character size strings from modifiers or race metadata and expose them via traits
• curb over-counted bonuses for saving throws, streamline initiative proficiency use, and broaden proficiency buckets to include advantages, tools, and save bonuses
• keep sense and inventory outputs intact while adding size-aware trait parsing helpers

Testing

• Not run (Node.js unavailable in environment)

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Codex Task