Propagate InsufficientGasLimit errors from v2_dispatch

[Copilot]

Implements Option A from review feedback: InsufficientGasLimit errors thrown in _dispatchCommand were being caught by v2_dispatch and converted to CommandFailed events, preventing the rethrow logic in v2_submit from ever triggering.

Changes

• v2_dispatch: Added revert data inspection in catch block to detect and rethrow InsufficientGasLimit errors instead of converting them to CommandFailed events
• testAgentCallContractRevertedForInsufficientGas: Updated to expect transaction revert instead of successful dispatch with command failure

Behavior

Gas limit violations now propagate through the call stack and revert the entire transaction:

// Before: InsufficientGasLimit caught and converted to CommandFailed
catch {
    emit IGatewayV2.CommandFailed(message.nonce, i);
    // ...
}

// After: InsufficientGasLimit propagates up
catch (bytes memory reason) {
    if (reason.length >= 4 && bytes4(reason) == IGatewayV2.InsufficientGasLimit.selector) {
        revert IGatewayV2.InsufficientGasLimit();
    }
    emit IGatewayV2.CommandFailed(message.nonce, i);
    // ...
}

Other command failures continue to emit CommandFailed events as before.

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