Remove AMPL (Ampleforth) from stablecoin lists

[0xBoxer]

Summary

• Remove AMPL (Ampleforth, 0xd46ba6d942050d489dbd938a2c909a5d5039a161) from the Ethereum core stablecoin list and stablecoin metadata
• AMPL is a rebase token, not a stablecoin — it should not be tracked as one

Test plan

• Verify dbt compile passes in the tokens sub-project
• Confirm AMPL no longer appears in downstream stablecoin balance/transfer models

🤖 Generated with Claude Code

[cursor]

PR Summary

Low Risk
Removes a single token address from two static stablecoin reference tables; main risk is downstream models/metrics no longer including AMPL balances/transfers.

Overview
Removes AMPL (Ampleforth, 0xd46ba6d942050d489dbd938a2c909a5d5039a161) from the Ethereum ERC-20 stablecoin core address list and from the cross-chain erc20_stablecoins_metadata static table.

As a result, AMPL will no longer be treated as a stablecoin in downstream dbt models that reference these lists.

^{Written by Cursor Bugbot for commit dfb98fe. Configure here.}