fix: expose runtime deps to copied user adapters

[jackwener]

Summary

• expose OpenCLI runtime dependencies to ~/.opencli/node_modules/ alongside the @jackwener/opencli package symlink
• resolve dependency package roots via Node module resolution so both hoisted and local installs work
• cover copied user adapters importing bare deps like chalk in engine tests

Testing

• npm test -- --run src/engine.test.ts
• npm run build
• HOME=$(mktemp -d) node dist/src/main.js --version