improve test assertions

[gabririgo]

src/llm/client.ts

Comment on lines +2492 to +2500

      let amountIn = (args.amountEth as string) || "";
      const amountOut = (args.amountOut as string) || "";

      // Reject ambiguous input: only one of amountEth or amountOut may be provided.
      if (amountIn && amountOut) {
        throw new Error(
          "Provide amountEth (native token input) OR amountOut (token output to receive), not both."
        );
      }

The refresh_oracle_feed tool now has several new branches (amountOut-based estimation, viaVault routing, EOA simulation/estimateGas, and defaulting amountEth to 0.001). There are existing unit tests for other src/llm/client.ts helpers, but none exercising this tool’s argument validation and branching; adding targeted tests would help prevent regressions (e.g., amountEth+amountOut rejection, amountOut requires vault+RPC, viaVault requires vault, negative/zero oracle estimates).