Master commits expand package retirement beyond recipes that have disappeared entirely. The earlier change associated with 
ryanrhughes, omacom/omarchy-pkgs@7c764cfb4bde, allows retiring an architecture a recipe no longer builds, addressing old x86_64 Pinta packages that shadow Arch's newer version.
emirb's omacom/omarchy-pkgs@56689c7d0d75 extends the decision to individual channels. Its stated case is obsolete development packages on stable that can derail switching from edge to stable. The planner also matches package bases to their actual recipes. omacom/omarchy-pkgs@d3995e0bef27 makes unreadable recipes stop planning entirely, preventing a read failure from being mistaken for a removed package. These commits change retirement tooling; they do not establish that the obsolete entries were removed.
