Initialize Rust GPUI browser shell

docs/reference-audit.md

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+# GPUI Reference Audit
+
+Local reference repositories:
+
+| Reference | Local path | Product use |
+|---|---|---|
+| gpui-component | `references/gpui-component` | Root window, input, button, sidebar, dock, list patterns |
+| awesome-gpui | `references/awesome-gpui` | Ecosystem index and repository mapping |
+| adabraka-ui | `references/adabraka-ui` | Clean desktop component patterns |
+| ferrum-flow | `references/ferrum-flow` | Future visual workflow panels |
+| gpui-flow | `references/gpui-flow` | Future rule/workflow graph panels |
+| gpui-form | `references/gpui-form` | Future settings form derive patterns |
+| gpui-hooks | `references/gpui-hooks` | Future reusable component state patterns |
+| gpui-nav | `references/gpui-nav` | Future settings/sidebar navigation |
+| gpui-router | `references/gpui-router` | Future `ely://settings/*` routing |
+| gpui-storybook | `references/gpui-storybook` | Future component story validation |
+| gpui-symbols | `references/gpui-symbols` | Future platform symbol integration |
+| gpui-tea | `references/gpui-tea` | Future event-loop state model |
+| gpui-video-player | `references/gpui-video-player` | Future downloaded media preview |
+| plotters-gpui | `references/plotters-gpui` | Future performance charts |
+| sotf | `references/sotf` | `gpui-d3rs` and `gpui-px` references |
+
+Copied patterns in the current implementation:
+
+- `gpui-component::Root` as the first window view.
+- `gpui_component::input::InputState` with typed `InputEvent` subscription.
+- `gpui_component::button::Button` for command actions.
+- GPUI model discipline: core state mutates once per user action, then the view calls `cx.notify()`.