unfinished thought: it would be quite good to have something like the Toolforge Abandoned Tool policy (https://wikitech.wikimedia.org/wiki/Help:Toolforge/Abandoned_tool_policy) for non-tool Wikimedia code, such as libraries (e.g. #m3api) or applications (e.g. Pattypan?)
this could be a step towards “Off-the-shelf governance models for small FOSS projects” (@pintoch, https://antonin.delpeuch.eu/posts/off-the-shelf-governance-models-for-small-foss-projects/) – if a codebase opts into it (README.md?), there would be an established process for adopting it if the maintainer goes inactive