Weekly link check: broken links found (2026-08-31)

These links returned an error that is not a bot wall, so they look genuinely broken:

```
https://agent-plugins.org/schemas/1.1.0/mcp.schema.json -> 404
https://agent-plugins.org/schemas/1.1.0/plugin.schema.json -> 404
```

See CONTRIBUTING.md for how entries get fixed or pulled.