Method updateProperty

src/services/TaskService.ts:565–676

* Update a single property of a task following the deterministic data flow pattern

(
		task: TaskInfo,
		property: keyof TaskInfo,
		value: unknown,
		options: { silent?: boolean } = {}
	)

	 * Update a single property of a task following the deterministic data flow pattern
	 */
	async updateProperty(
		task: TaskInfo,
		property: keyof TaskInfo,
		value: unknown,
		options: { silent?: boolean } = {}
	): Promise<TaskInfo> {
		try {
			const file = this.plugin.app.vault.getAbstractFileByPath(task.path);
			if (!(file instanceof TFile)) {
				throw new Error(`Cannot find task file: ${task.path}`);
			}

			// Get fresh task data to prevent overwrites
			const freshTask = (await this.plugin.cacheManager.getTaskInfo(task.path)) || task;

			// Step 1: Construct new state in memory using fresh data
			const updatePlan = buildTaskPropertyUpdatePlan({
				freshTask,
				property,
				value,
				currentTimestamp: getCurrentTimestamp(),
				currentDateString: this.getCompletionDateForTask(freshTask),
				normalizeStatusValue: (candidate) => this.normalizeStatusValue(candidate),
				isCompletedStatus: (status) => this.plugin.statusManager.isCompletedStatus(status),
			});

			if (property === "scheduled") {
				applyGoogleCalendarRecurringExceptionForScheduledChange(
					freshTask,
					updatePlan.normalizedValue,
					updatePlan.updatedTask
				);
			}
			if (property === "recurrence" || property === "recurrence_anchor") {
				applyGoogleCalendarRecurringExceptionCleanup(updatePlan.updatedTask);
			}

			// Step 2: Persist to file
			await this.plugin.app.fileManager.processFrontMatter(file, (frontmatter) => {
				// Use field mapper to get the correct frontmatter property name
				const fieldName = resolveTaskPropertyFrontmatterField(
					this.plugin.fieldMapper,
					property
				);
				const dateModifiedField = this.plugin.fieldMapper.toUserField("dateModified");
				const completedDateField = this.plugin.fieldMapper.toUserField("completedDate");
				applyTaskPropertyFrontmatterChange({
					frontmatter,
					property,
					fieldName,
					rawValue: value,
					normalizedValue: updatePlan.normalizedValue,
					dateModified: updatePlan.dateModified,
					dateModifiedField,
					completedDateField,
					isRecurring: !!freshTask.recurrence,
					normalizeStatusValue: (candidate) => this.normalizeStatusValue(candidate),
					isCompletedStatus: (status) =>