feat(db): mesh data model — meshes, members, invites, audit log

- pgSchema "mesh" with 4 tables isolating the peer mesh domain
- Enums: visibility, transport, tier, role
- audit_log is metadata-only (E2E encryption enforced at broker/client)
- Cascade on mesh delete, soft-delete via archivedAt/revokedAt

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tooling/scripts/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "scripts",
+  "private": true,
+  "version": "0.1.0",
+  "scripts": {
+    "dev": "node ./src/dev.mjs",
+    "requirements": "node ./src/requirements.mjs",
+    "license": "node ./src/license.mjs"
+  }
+}