Stablecoin limit parsing assumes all tokens have same decimals

Problem

The limit parsing logic may assume all stablecoins have the same decimal places (6). Tokens like FRAX have 18 decimals.

Location

src/agent/limits.ts:144

Impact

• Limits could be off by orders of magnitude for 18-decimal tokens
• A $100 limit could become $100,000,000,000 for wrong decimal handling

Recommendation

1. Always use the token's actual decimal count from StablecoinInfo
2. Add validation that decimals match expected values
3. Add tests for tokens with different decimal counts

private parseAmount(amount: string, stablecoin: StablecoinInfo): bigint {
  const decimals = stablecoin.decimals; // Use actual decimals, not hardcoded
  return parseUnits(amount, decimals);
}

Priority

Medium - Financial correctness

Start at src/agent/limits.ts:144 and inspect how parseAmount uses StablecoinInfo.decimals. Add coverage for stablecoins with different decimal counts, including an 18-decimal token such as FRAX, and verify that parsed limits preserve the intended dollar amounts.