Hi! So yes, you're welcome to use Espruino for commercial projects without having to pay anything, and there are several companies that do.
The Licence (MPLv2) states that any sourcefiles you modify you must make publicly available, but if you add source files, there is no need to share those. Also don't use the Espruino trademark in advertising (eg don't call it an "Espruino device") without checking with me first. Other than that you can use it as you want.
So I think you should be fine - and yes, Espruino is definitely stable enough for use in production. Although I'd recommend that you personally test each release works with your software before using it :)
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