iris: load application-owned fonts

AGENTS.md

@@ -38,9 +38,10 @@ dependency runs one way.
   `--recurse-submodules` or run `git submodule update --init`.
 - `docs/` — design and working documents.
 
-Nerd Font icons are a committed subset. `iris/core/build-icon-font.sh`
-produces `iris/core/assets/fonts/nerd_icons.ttf`; its codepoints must match
-`iris/core/src/icon.rs`. Body and monospace fonts come from the platform.
+Nerd Font icons are an app-owned committed subset. `app/build-icon-font.sh`
+produces `app/assets/fonts/nerd_icons.ttf`; its codepoints must match
+`app/src/ui/icon.rs`. The app registers it with Iris at startup. Body and
+monospace fonts come from the platform; Iris ships no font assets.
 
 ## Checking work