feat: add Ollama proxy timeouts, SSH key migration, polish skills, and demo content

- Update all skill SSH commands from sshpass to key-based auth (~/.ssh/archipelago-deploy)
- Add proxy_connect_timeout 120s to nginx Ollama location blocks
- Add new polish/sweep skills for overnight automation
- Add demo content (documents, photos) for demo stack
- Add .ssh/ to .gitignore

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

.claude/skills/deploy/SKILL.md

@@ -18,7 +18,7 @@ Deploy all changes to the live server (192.168.1.228).
 
 3. After deploy completes, verify the server is healthy:
    ```bash
-   sshpass -p 'EwPDR8q45l0Upx@' ssh -o StrictHostKeyChecking=no archipelago@192.168.1.228 'systemctl is-active archipelago nginx && sudo journalctl -u archipelago -n 10 --no-pager'
+   ssh -i ~/.ssh/archipelago-deploy archipelago@192.168.1.228 'systemctl is-active archipelago nginx && sudo journalctl -u archipelago -n 10 --no-pager'
    ```
 
 4. Report whether the deploy succeeded and if any errors appeared in the logs.