Wish I could just edit this...
Corrected installation instructions (now pointing at the right fork and branch):
git clone git@github.com:shirakaba/10ten-ja-reader.git
cd 10ten-ja-reader
git checkout feat/puck
yarn install
npm run build:safari
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Got to the bottom of it using opensnoop. Whoever had written the static library had built their own custom CLI argument parser that simply split arguments on whitespace without taking note of string quotes or escape characters, and my App Extension had a space in its name so it ended up asking to read a resource from a path that involved a space... and went off looking for a file outside of the container’s file system due to the broken filepath.
So indeed it wasn’t a Sandbox issue after all. Thanks!
Is the bundle nested inside the .appex? @eskimo Yes, both the static library and the Cocoa Resource bundle are nested inside the .appex.