chore: upgrade Node.js runtime to v24 across codebase

- Update .woodpecker/codex-review.yml: node:22-slim → node:24-slim
- Update packages/cli-tools engines: >=18 → >=24.0.0
- Update README.md, CONTRIBUTING.md, prerequisites docs to reference Node 24+
- Rename eslint.config.js → eslint.config.mjs to eliminate Node 24
  MODULE_TYPELESS_PACKAGE_JSON warnings (ESM detection overhead)
- Add .nvmrc targeting Node 24
- Fix pre-existing no-unsafe-return lint error in matrix-room.service.ts
- Add Campsite Rule to CLAUDE.md
- Regenerate Prisma client for Node 24 compatibility

All Dockerfiles and main CI pipelines already used node:24. This commit
aligns the remaining stragglers (codex-review CI, cli-tools engines,
documentation) and resolves Node 24 ESM module detection warnings.

Quality gates: lint ✅ typecheck ✅ tests ✅ (6 pre-existing API failures)

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

docs/1-getting-started/2-installation/1-prerequisites.md

@@ -4,26 +4,26 @@ Required and optional software for Mosaic Stack development.
 
 ## Required
 
-### Node.js 20+
+### Node.js 24+
 
 ```bash
 # Install using nvm (recommended)
-curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.0/install.sh | bash
-nvm install 20
-nvm use 20
+curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.40.0/install.sh | bash
+nvm install 24
+nvm use 24
 
 # Verify installation
-node --version  # Should be v20.x.x
+node --version  # Should be v24.x.x
 ```
 
-### pnpm 9+
+### pnpm 10+
 
 ```bash
 # Install globally
-npm install -g pnpm@9
+npm install -g pnpm@10
 
 # Verify installation
-pnpm --version  # Should be 9.x.x
+pnpm --version  # Should be 10.x.x
 ```
 
 ### PostgreSQL 17+
@@ -158,8 +158,8 @@ Configure `OLLAMA_MODE=remote` and `OLLAMA_ENDPOINT` in `.env`.
 Check all required tools are installed:
 
 ```bash
-node --version      # v20.x.x or higher
-pnpm --version      # 9.x.x or higher
+node --version      # v24.x.x or higher
+pnpm --version      # 10.x.x or higher
 git --version       # 2.x.x or higher
 docker --version    # 24.x.x or higher (if using Docker)
 psql --version      # 17.x.x or higher (if using native PostgreSQL)