docs: add 11 new pages + expand 4 existing pages (26 → 37 total)

New pages (sourced from actual codebase):
- Security: command approval, DM pairing, container isolation, production checklist
- Session Management: resume, export, prune, search, per-platform tracking
- Context Files: AGENTS.md project context, discovery, size limits, security
- Personality: SOUL.md, 14 built-in personalities, custom definitions
- Browser Automation: Browserbase setup, 10 browser tools, stealth mode
- Image Generation: FLUX 2 Pro via FAL, aspect ratios, auto-upscaling
- Provider Routing: OpenRouter sort/only/ignore/order config
- Honcho: AI-native memory integration, setup, peer config
- Home Assistant: HASS setup, 4 HA tools, WebSocket gateway
- Batch Processing: trajectory generation, dataset format, checkpointing
- RL Training: Atropos/Tinker integration, environments, workflow

Expanded pages:
- code-execution: 51 → 195 lines (examples, limits, security, comparison table)
- delegation: 60 → 216 lines (context tips, batch mode, model override)
- cron: 88 → 273 lines (real-world examples, delivery options, expression cheat sheet)
- memory: 98 → 249 lines (best practices, capacity management, examples)

website/sidebars.ts

@@ -19,6 +19,8 @@ const sidebars: SidebarsConfig = {
       items: [
         'user-guide/cli',
         'user-guide/configuration',
+        'user-guide/sessions',
+        'user-guide/security',
         {
           type: 'category',
           label: 'Messaging Gateway',
@@ -28,6 +30,7 @@ const sidebars: SidebarsConfig = {
             'user-guide/messaging/discord',
             'user-guide/messaging/slack',
             'user-guide/messaging/whatsapp',
+            'user-guide/messaging/homeassistant',
           ],
         },
         {
@@ -37,12 +40,20 @@ const sidebars: SidebarsConfig = {
             'user-guide/features/tools',
             'user-guide/features/skills',
             'user-guide/features/memory',
+            'user-guide/features/context-files',
+            'user-guide/features/personality',
             'user-guide/features/mcp',
             'user-guide/features/cron',
             'user-guide/features/hooks',
             'user-guide/features/delegation',
             'user-guide/features/code-execution',
+            'user-guide/features/browser',
+            'user-guide/features/image-generation',
             'user-guide/features/tts',
+            'user-guide/features/provider-routing',
+            'user-guide/features/honcho',
+            'user-guide/features/batch-processing',
+            'user-guide/features/rl-training',
           ],
         },
       ],