Spike native shells and define local-first integrations

docs/UI_SPIKE_SCORECARD.md

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+# Native UI spike scorecard
+
+The GPUI and Floem programs under `spikes/` consume the same six-pane fixture.
+No product framework decision is accepted until both rows contain measurements
+from macOS and Linux and the hard gates pass.
+
+| Criterion | Hard gate | GPUI | Floem |
+|---|---:|---:|---:|
+| Builds on macOS Apple Silicon | yes | pending | pending |
+| Builds on Ubuntu | yes | pending | pending |
+| Builds on Omarchy/Arch | yes | pending | pending |
+| Dependency/license closure permits Apache-2.0 distribution | yes | pending | pending |
+| Keyboard navigation + AccessKit tree | yes | pending | pending |
+| IME and composed Unicode input | yes | pending | pending |
+| Isolated system browser child | yes | pending | pending |
+| Cold startup, p50/p95 | record | pending | pending |
+| Idle RSS / six-stream RSS | record | pending | pending |
+| Key-to-present p50/p95 | record | pending | pending |
+| Six-stream frame p95/p99 | record | pending | pending |
+| Release binary/package size | record | pending | pending |
+| Native menu/window/clipboard/drag-and-drop | review | pending | pending |
+| API clarity and maintenance burden | review | pending | pending |
+
+The current programs establish dependency, build, launch, and static layout
+baselines. The next iteration adds deterministic streaming, input timestamps,
+accessibility identifiers, a native Markdown editor, and one Wry browser child.