Adds a single zap.Info line after the membership-insertion loop so
the boot log explicitly shows how many participants the sandbox
provisioned. The number is fixed by config (PlayerCount) but
surfacing it in the log makes troubleshooting "why is the lobby
empty" cases (typo in the email, partial failure) faster than
querying the DB.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Ilia Denisov
804fdd2a72