feat(FN-3175): document global tool output persistence setting in settings

Added documentation for the global tool output persistence setting to the settings reference guide.

Fusion-Task-Id: FN-3175

docs/settings-reference.md

@@ -76,6 +76,7 @@ Defaults from `DEFAULT_GLOBAL_SETTINGS`; key scope from `GLOBAL_SETTINGS_KEYS`.
 
 > Mesh lifecycle note: settings sync is executed by the process-level `PeerExchangeService` started by `fn serve`/`fn dashboard`. `InProcessRuntime` does not instantiate settings-sync mesh services per project.
 | `dashboardCurrentProjectIdByNode` | `Record<string, string>` | `undefined` | Map of node ID to last-selected project ID. Use key `"local"` for the local node. Persists project context across browser restarts and PWA sessions. |
+| `persistAgentToolOutput` | `boolean` | `true` | Controls whether detailed `detail` payloads are persisted for `tool`, `tool_result`, and `tool_error` agent log entries. When disabled, tool timeline rows are still recorded, but verbose payloads are omitted. |
 | `researchGlobalDefaults` | `ResearchGlobalDefaults` | `{ searchProvider: undefined, synthesisProvider: undefined, synthesisModelId: undefined, enabledSources: { webSearch: true, pageFetch: true, github: false, localDocs: true, llmSynthesis: true }, maxSourcesPerRun: 20, defaultExportFormat: "markdown" }` | Global Research defaults shared by all projects. Project overrides come from `researchSettings`. |
 | `experimentalFeatures` | `Record<string, boolean>` | `{}` | Global-scoped experimental feature flags. Includes `experimentalFeatures.researchView` for standalone Research route visibility. |
 | `remoteAccess` | `RemoteAccessSettings` | `{ activeProvider: null, providers: {...}, tokenStrategy: {...}, lifecycle: {...} }` | Global-scoped remote access provider + token strategy configuration used by Remote Access routes and tunnel lifecycle controls. |