D022 - Package writing stays blocked, and the source that looked like it might unblock it does not

ps5upload turned up during the PARAM.SFO work - Rust, open-source, and it handles packages. It is a reader. Its build_pkg functions are test fixtures that construct enough of a header for its own parser, not a package anything would install.

So D012 stands unchanged: six of fourteen entries have no established meaning, two of those are plausibly digest tables, and plausibly is not something to build on. What is needed is still a packaging tool whose source says what goes in those entries.

Recorded because a near-miss that is not written down gets re-investigated.