This is very cool. Nice work! At my day job, I have been using a Go library[1] to build tools that require seekable zstd, but felt a bit uncomfortable with the lack of broader support for the format.
Why zeek, BTW? Is it a play on "zstd" and "seek"? My employer is also the custodian of the zeek project (https://zeek.org), so I was confused for a second.