fix: remove npm cache from CI (no lock file in repo)

The waypath repo intentionally does not commit package-lock.json
since the only runtime dependency (better-sqlite3) is optional and
dev dependencies are empty. Cache requires a lock file, so drop it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: TheStack-ai

.github/workflows/ci.yml

@@ -21,7 +21,6 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-          cache: 'npm'
 
       - name: Install dependencies
         run: npm install