Capacitor's JS proxy requires plugin headers exported at startup to
route calls to the native bridge. Without a header, calls short-circuit
to UNIMPLEMENTED entirely in JS, never reaching the native lazy-loader.
Since npx cap sync only discovers SPM-packaged plugins for
packageClassList, local plugins like SandboxPlugin are omitted.
Add scripts/patch-cap-config.mjs that appends local plugin class names
to capacitor.config.json after sync. Wire it into:
- npm run cap:sync (new convenience script)
- .gitlab-ci.yml build-apk job
Alex Gleason