fix(ci): remove prepare scripts — they trigger build during npm ci before deps are ready

The prepare lifecycle hook runs automatically during npm install/ci.
In our monorepo it would invoke tsc + esbuild before workspace packages
are fully linked, causing npm ci to fail on every CI run.
The explicit 'Build all packages' step in the workflow handles this.
Also restore npm ci (correct tool) now that prepare is gone.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: faical-yannick-congo

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
           cache: 'npm'
 
       - name: Install dependencies
-        run: npm install --prefer-offline
+        run: npm ci
 
       - name: Build all packages
         run: npm run build

packages/cli/package.json

@@ -14,7 +14,6 @@
   },
   "scripts": {
     "build": "tsc --noEmit && node build.mjs",
-    "prepare": "npm run build",
     "start": "node dist/index.js",
     "test": "vitest"
   },

packages/mcp-server/package.json

@@ -16,7 +16,6 @@
   },
   "scripts": {
     "build": "tsc --noEmit && node build.mjs",
-    "prepare": "npm run build",
     "start": "node dist/bin.js",
     "test": "vitest"
   },