feat(FN-3076): add automatic completion documentation mode for tasks

Merged FN-3076 introducing an auto completion-doc mode that automates task completion documentation. The feature adds a new setting to the settings schema and types, surfaces it in the dashboard Settings UI, provides triage-stage guidance to suggest completion documentation, and is documented in the

Fusion-Task-Id: FN-3076

packages/core/src/settings-schema.ts

@@ -181,6 +181,7 @@ export const DEFAULT_PROJECT_SETTINGS = {
   validatorFallbackModelId: undefined,
   modelPresets: [],
   autoSelectModelPreset: false,
+  completionDocumentationMode: "off",
   defaultPresetBySize: {},
   autoResolveConflicts: true,
   smartConflictResolution: true,