Stuck sell path on graduated launchpad tokens

A user reported they couldn't sell tokens that had graduated from the launchpad to the open AMM. Swap quote returned valid, swap submit returned 0x1771 — slippage exceeded. Except slippage tolerance was 50%. Real cause: the bonding curve's migrate_authority had handed liquidity to the AMM, but our frontend was still pulling quotes from the bonding-curve route. Fixed by checking the migration flag…