Verified tool/library-specific quirks and gotchas in the workspace stack (typer, jupytext, ...). Each entry is an empirically-hit surprise where a tool deviates from its docs, its upstream, or reasonable expectation. Consult when designing a CLI surface (typer), syncing or regenerating jupytext pairs, or when a library behaves unexpectedly; append a new entry when a quirk costs a mid-build probe.
