A crate built on benilla through `run_with` has its own `benilla-config/`, but could not ask where it is: `local_state::home` is crate-private. A crate that ships an addon has to write it into that folder's `AddOns/`, where benilla discovers addons and resolves their art and fonts, so without the path it needed a fork.
- `benilla_app::config_dir()` answers `local_state::home()`, asked from `run_with` on, since a dev build resolves it from the launcher's folder set there.
- CONTRIBUTING's "Building on top" says a crate's files and addons go there, and names `run_with` and this folder as the two seams opened for crates alone.
- The example launcher logs its `AddOns/` folder through it, so the example, which clippy and the tests build, is the outside caller that keeps it public.
No 1.12.1 behaviour changes.
Fixes#807🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
