Core ride logic, FTMS client, FIT encoder and probe CLI

Adds backing state for Resistance and Erg control modes, which had no
value to hold and so could never satisfy FR-4.3/FR-4.6.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

ui/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "bikecontrol-ui",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "check": "svelte-check --tsconfig ./tsconfig.json",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@tauri-apps/api": "^2.9.0",
+    "@tauri-apps/plugin-dialog": "^2.4.0",
+    "uplot": "^1.6.32"
+  },
+  "devDependencies": {
+    "@sveltejs/vite-plugin-svelte": "^5.0.3",
+    "@tsconfig/svelte": "^5.0.4",
+    "svelte": "^5.19.0",
+    "svelte-check": "^4.1.4",
+    "tslib": "^2.8.1",
+    "typescript": "^5.7.3",
+    "vite": "^6.0.11"
+  },
+  "allowScripts": {
+    "esbuild@0.25.12": true
+  }
+}