Method handleFileChanged

src/utils/DependencyCache.ts:140–180

* Handle file changes

(file: TFile, cache: unknown)

	 * Handle file changes
	 */
	private handleFileChanged(file: TFile, cache: unknown): void {
		const before = this.getFileRelationshipSignature(file.path);

		if (!this.isValidFile(file.path)) {
			this.clearFileFromIndexes(file.path);
			this.triggerIfFileRelationshipsChanged(file.path, before);
			return;
		}

		const frontmatter = this.getFrontmatterFromCache(cache) ?? this.getFrontmatterForFile(file);
		this.updateCompletionState(file.path, frontmatter);

		if (!frontmatter) {
			if (this.hasForwardRelationships(file.path)) {
				this.clearForwardDependencies(file.path);
			}
			this.triggerIfFileRelationshipsChanged(file.path, before);
			return;
		}

		if (!this.isTaskFileCallback(frontmatter)) {
			if (this.hasForwardRelationships(file.path)) {
				this.clearForwardDependencies(file.path);
			}
			this.triggerIfFileRelationshipsChanged(file.path, before);
			return;
		}

		const nextFingerprint = this.buildRelationshipFingerprint(frontmatter);
		if (this.relationshipFingerprints.get(file.path) === nextFingerprint) {
			this.triggerIfFileRelationshipsChanged(file.path, before);
			return;
		}

		// Re-index this task
		// Only clear the forward dependencies (tasks this task depends on)
		// Keep reverse dependencies intact - they'll be updated when other tasks change
		this.clearForwardDependencies(file.path);
		this.indexTaskFile(file.path, frontmatter);
		this.triggerIfFileRelationshipsChanged(file.path, before);
	}

	private triggerIfFileRelationshipsChanged(path: string, before: string): void {
		if (this.getFileRelationshipSignature(path) !== before) {