Stop committing auto-generated .adonisjs/ assembler output
The AdonisJS assembler regenerates these on `node ace serve`/`build`,
and the files themselves declare "DO NOT EDIT manually" — keeping them
tracked produced recurring "regenerate routes.d.ts" churn commits.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>