docs: update CLAUDE.md files for static legal model

Remove DB-backed legal document system references across all repos.
Update root CLAUDE.md: replace "Legal System" section with static
document workflow; add step to remind Paul about material-change emails.
Update api/: remove LegalDocument model, Legal route table, legal:write
from permission matrix, whoami grace-period bullet.
Update frontend/: update /terms /privacy page descriptions, remove
legal-service.ts, remove legal types, replace banner/grace-period
behaviors with static model.
Update queue-worker/: remove legal-update.ts worker row and queue ref.
Update mcp-server/: remove Legal tool category, tool count 89 → 85.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -18,7 +18,6 @@ Auth: `BETTERNEWS_API_KEY` env var, sent as `Authorization: Bearer` on every req
 | `src/tools/user.ts` | 7 user/profile tools |
 | `src/tools/moderation.ts` | 11 moderation tools |
 | `src/tools/tickets.ts` | 5 support ticket tools |
-| `src/tools/legal.ts` | 4 legal document tools |
 | `src/tools/blog.ts` | 7 blog tools |
 | `src/tools/api-keys.ts` | 4 API key tools |
 | `src/tools/sessions.ts` | 3 session tools |
@@ -118,15 +117,6 @@ Format: `tool_name` → file → `METHOD /api/route` → minimum auth
 | `reply_to_ticket` | `POST /api/tickets/{id}/reply` | `tickets:write` |
 | `update_ticket_status` | `PATCH /api/tickets/{id}/status` | `tickets:moderate` Mod/Admin |
 
-### Legal — `tools/legal.ts`
-
-| Tool | Route | Auth |
-| ---- | ----- | ---- |
-| `get_terms_of_service` | `GET /api/legal/current/terms_of_service` | public |
-| `get_privacy_policy` | `GET /api/legal/current/privacy_policy` | public |
-| `list_legal_documents` | `GET /api/legal` | optional; Mod/Admin see drafts |
-| `accept_legal_documents` | `POST /api/legal/accept` | User+ |
-
 ### Blog — `tools/blog.ts`
 
 | Tool | Route | Auth |