Improved trait prompt

[sfreeman422]

This pull request updates the deduplication and phrasing guidelines for user traits in the ai.constants.ts file. The main focus is to ensure trait lists are both clear and non-redundant by treating similar meanings as duplicates and preferring the best possible phrasing.

Trait deduplication and phrasing improvements:

• Added instructions to treat semantically similar phrasings as duplicates, not just exact wording matches.
• Specified that only one canonical version of a trait should be kept, and the rest should be dropped.
• Clarified that the canonical trait should be the clearest, most specific, and most durable version.
• Required a final deduplication pass to remove any overlapping traits before finalizing the list.

[Copilot]

Pull request overview

This PR refines the TRAIT_EXTRACTION_PROMPT guidance to more explicitly prevent duplicate/overlapping traits by adding clearer semantic de-duplication instructions.

Changes:

• Adds explicit rules to treat semantically similar traits as duplicates (even with different wording).
• Instructs the model to select a single canonical phrasing per underlying trait and run a final dedupe pass.

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