fix: respect disabled_tools config in agent prompts (fixes #2742)

- Check disabled_tools for 'question' in tool-config-handler permission logic
- Strip Question tool code examples from Prometheus prompts when disabled
- Pass disabled_tools through prometheus agent config builder pipeline
- Add tests for disabled_tools question permission handling

src/plugin-handlers/agent-config-handler.ts

@@ -186,6 +186,7 @@ export async function applyAgentConfig(params: {
         pluginPrometheusOverride: prometheusOverride,
         userCategories: params.pluginConfig.categories,
         currentModel,
+        disabledTools: params.pluginConfig.disabled_tools,
       });
     }