Add keep overview command and a docker-compose deploy wrapper

keep overview gives an admin a cross-vault view of every recipient and
grant in one screen, instead of walking vaults one at a time via
/vaults/:key/recipients. scripts/deploy.sh pulls a project's env from
keep before running docker compose up, for VPS deploys of several
docker-compose projects.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

IMPLEMENTATION.md

@@ -189,6 +189,7 @@ keep recipient add --label "..." --pubkey <hex>
 keep recipient list
 keep recipient remove <recipient-id>
 keep revoke <vault> <recipient-id>
+keep overview                             -- every vault + every grant in one screen (GET /api/admin/overview)
 ```
 
 ### Admin operations need their own authorization story