refactor(v2): move setup/groups.ts off trunk + drop pino dep

setup/groups.ts is whatsapp-only — its inline syncScript imports baileys
and pino to fetch group metadata via Baileys.groupFetchAllParticipating.
On trunk it was a no-op for non-whatsapp users (returned early without
auth) and the only thing keeping pino alive.

Removed:
- setup/groups.ts (lives on `channels` branch; restored by /add-whatsapp-v2)
- `groups` STEPS entry from setup/index.ts
- pino from package.json (no longer used outside the moved file)

/add-whatsapp-v2 skill updated to copy setup/groups.ts and register both
groups + whatsapp-auth in setup/index.ts STEPS, install pino@9.6.0 along
with baileys + qrcode.

Verified: build clean, 326 host tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -25,8 +25,7 @@
     "@onecli-sh/sdk": "^0.3.1",
     "better-sqlite3": "11.10.0",
     "chat": "^4.24.0",
-    "cron-parser": "5.5.0",
-    "pino": "^9.6.0"
+    "cron-parser": "5.5.0"
   },
   "devDependencies": {
     "@eslint/js": "^9.35.0",