Phase 1: scaffold + metronome engine + R1

Svelte 5 + Vite static SPA with absolute base and History-API path routing.
Core lookahead-scheduler metronome (no drift), AudioContext unlock-on-gesture,
synthesized 3-voice clicks, rAF-synced beat highlight. StrumGrid renderer and
R1 wired end-to-end with variants, BPM/variant persistence, query overrides,
and keyboard shortcuts (space, arrow up/down). Dark amp-light theme tokens.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package.json

@@ -0,0 +1,28 @@
+{
+  "name": "guitar-practice-tool",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "svelte-check --tsconfig ./tsconfig.json && vite build",
+    "build:only": "vite build",
+    "preview": "vite preview",
+    "check": "svelte-check --tsconfig ./tsconfig.json",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "devDependencies": {
+    "@sveltejs/vite-plugin-svelte": "^5.0.3",
+    "@tsconfig/svelte": "^5.0.4",
+    "@types/node": "^26.1.1",
+    "svelte": "^5.19.0",
+    "svelte-check": "^4.1.4",
+    "typescript": "^5.7.3",
+    "vite": "^6.0.11",
+    "vitest": "^3.0.4"
+  },
+  "dependencies": {
+    "tonal": "^6.4.0"
+  }
+}