Collectives P1: participation landing (ES/EN), group tree, room provisioning APIs

- 030: groups.parent_id tree + kind discriminator + group_rooms mapping
- /collectives module: create/tree/join APIs, MatrixProvisioner (open room
  public+federated, closed room E2EE-at-creation, onboarding room), NullProvisioner
  fail-soft when ARCHIVE_PROVISIONER_* unset
- web root becomes the public participation manual (ES-first + EN toggle,
  three paths: join by invite, start collective, solo account)
- participation manual content in core

apps/web/package.json

@@ -6,10 +6,12 @@
     "dev": "next dev",
     "build": "next build",
     "lint": "eslint src",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit",
+    "test:manual": "node --require ./scripts/control-room-register.cjs --test src/lib/participation-manual.test.ts"
   },
   "dependencies": {
     "@tactical-media-broadcast-hub/connector-sdk": "workspace:^",
+    "@tactical-media-broadcast-hub/core": "workspace:^",
     "@tailwindcss/postcss": "^4.3.3",
     "@tanstack/react-virtual": "^3.14.13",
     "@tiptap/extension-character-count": "^3.31.4",