Hi, Paweł!
Execuse me for late answer :(
Just to confirm. You was read built-in documentation for cookutils? And wrote receipt. And cooked your package well in your local build host? And you was installed your package into clean system, and it works well? Great!
It takes me some days to run from scratch: to read docs, to install build host, to read/write receipts...
SliTaz have several online repos for packages receipt. They all placed in the hg.slitaz.org, and they have names: wok, wok-stable, wok-tiny, wok-undigest. Really, I don't know for what we have so many woks, I think: wok-tiny for tiny-slitaz project; wok (just) for cooking/rolling current SliTaz; wok-stable for latest stable SliTaz release (now 4.0); wok-undigest for what?
Next, only developers have write access to Hg repos. If you want to develop SliTaz (write receipts, change scripts and tools, translate website and docs...) then you need write access to Hg. You need to contact with SliTaz Maintainer Christophe Lincoln (pankso).
But for single commits, anyone can write their patches and peceipts, and share with current developers via mailing list or forum. I mean, you can rename your "receipt" to "receipt.txt" (or compress it using zip or tar.gz) right now, and attach it to this forum topic. (I heard some people has troubles with attachments, so I can mail you, and you'll mail me back your receipt).
Have a nice day!