feat: Simplify architecture with Cortex orchestrator and clear augmentation tiers

## Major Architecture Improvements

### Cortex Refactoring
- Renamed AugmentationPipeline → Cortex for clarity
- Cortex is now the central orchestrator (not an augmentation)
- NeuralImport remains as the AI-powered SENSE augmentation
- Clean brain metaphor: BrainyData → Cortex → Augmentations

### Four-Tier Augmentation System
1. **Built-in** (Free, MIT): Neural Import, basic storage, search
2. **Community** (Free, npm): Community-created augmentations
3. **Premium** ($49-299/mo): AI Memory, Agent Coordinator, Enterprise connectors
4. **Brain Cloud** ($19-99/mo): Managed service with all features

### Zero Configuration Philosophy
- Everything works out of the box - no config needed
- Automatic model detection and loading
- Seamless integration between tiers
- Brain Cloud connects with one command: `brainy cloud`

### Documentation Updates
- Added PHILOSOPHY.md outlining design principles
- Created AUGMENTATION_ARCHITECTURE.md with tier system
- Added CLI_AUGMENTATION_GUIDE.md for augmentation management
- Updated README to "sell first" with concrete use cases
- Improved documentation organization in /docs

### Developer Experience
- Backward compatibility maintained with exports
- Clean, simple API surface
- Interactive-by-default approach
- Premium features integrate seamlessly

### Removed
- Deleted demo directory and deploy workflow (moved to website)
- Removed test wrapper scripts (bash 2>&1 bug workaround)

This refactor makes Brainy incredibly powerful yet easy to use, with everything automated and no configuration required. The Brain Cloud augmentations (AI memory, sync, coordination) integrate seamlessly as our killer features.

.github/workflows/deploy-demo.yml

@@ -1,73 +0,0 @@
-name: Deploy Demo to GitHub Pages
-
-on:
-  push:
-    branches: [ main ]
-  workflow_dispatch:
-
-# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
-permissions:
-  contents: read
-  pages: write
-  id-token: write
-
-# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
-# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
-concurrency:
-  group: "pages"
-  cancel-in-progress: false
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout 🛎️
-        uses: actions/checkout@v4
-
-      - name: Setup Node.js 🔧
-        uses: actions/setup-node@v3
-        with:
-          node-version: '20'
-          cache: 'npm'
-
-      - name: Install dependencies 📦
-        run: npm install --legacy-peer-deps
-
-      - name: Build project 🏗️
-        run: |
-          npm run build
-
-      - name: Build Angular demo 🏗️
-        run: |
-          cd demo/brainy-angular-demo
-          npm install --legacy-peer-deps
-          npm run build
-
-      - name: Prepare deployment 📦
-        run: |
-          mkdir -p _site
-          mkdir -p _site/demo
-          mkdir -p _site/dist
-          cp demo/index.html _site/index.html
-          cp -r demo/brainy-angular-demo/dist/brainy-angular-demo/* _site/demo/
-          cp -r dist/* _site/dist/
-          cp brainy.png _site/
-          # Copy dist directly to demo/dist for easier access
-          mkdir -p _site/demo/dist
-          cp -r dist/* _site/demo/dist/
-
-      - name: Upload artifact
-        uses: actions/upload-pages-artifact@v3
-        with:
-          path: _site
-
-  deploy:
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: ubuntu-latest
-    needs: build
-    steps:
-      - name: Deploy to GitHub Pages
-        id: deployment
-        uses: actions/deploy-pages@v4