Adds a script that verifies every packages/*/package.json is listed in
all app Dockerfiles. Catches the recurring issue where adding a new
workspace package breaks production because the Dockerfile deps stage
doesn't know about it.
Also fixes two pre-existing missing packages in the planner Dockerfile
(api, map-core) caught by the new check.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
