Slice 1: surface system + WS transport + composition root

Pure-core feature libraries assembled at the composition root:
- core/protocol: pure reducer over surface catalog/spec/error messages
- features/surface-host: generic field-kind interpreter (toggle/progress/
  selector/stat/button) + pure plan logic; no surface-id special-casing
- adapters/ws: injected WebSocket client (effects at the edge)
- app: composition root store (Svelte 5 runes over the pure reducer),
  host-relative surface WS URL resolution (resolveWsUrl), root App.svelte

Verified green: svelte-check 0/0, vitest 84 passed, biome clean, vite build ok.

1 files changed, 18 insertions, 0 deletions

diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..02d6f89
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,18 @@
+{
+	"extends": "@tsconfig/svelte/tsconfig.json",
+	"compilerOptions": {
+		"target": "ES2022",
+		"module": "ESNext",
+		"moduleResolution": "bundler",
+		"types": ["vite/client"],
+		"strict": true,
+		"noUncheckedIndexedAccess": true,
+		"noImplicitOverride": true,
+		"exactOptionalPropertyTypes": true,
+		"verbatimModuleSyntax": true,
+		"isolatedModules": true,
+		"skipLibCheck": true,
+		"noEmit": true
+	},
+	"include": ["src/**/*.ts", "src/**/*.svelte", "src/**/*.d.ts", "vitest-setup.ts"]
+}