[lorenz234]

Add three payment-category entries using colors from the existing bucket palette:

• Cards: #4C8DF0 (blue)
• Agentic: #2BC4B0 (teal)
• Commerce: #F2A03C (orange)

[cursor]

PR Summary

Low Risk
Data-only JSON palette additions with no application logic changes.

Overview
Adds three payment-category color keys to color-palettes.json: Cards (#4C8DF0), Agentic (#2BC4B0), and Commerce (#F2A03C), each with lowercase aliases (cards, agentic, commerce). The hex values match colors already used in the volume-bucket entries (0-1, 1-100, 10k-100k).

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