Method invalidateFile

frontend/src/cache.ts:1418–1433

* Invalidate a single file and its cross-file edges

(filePath: string)

     * Invalidate a single file and its cross-file edges
     */
    async invalidateFile(filePath: string): Promise<void> {
        await this.initPromise;

        // Normalize path to full path (cache keys are always full paths)
        const normalizedPath = this.toRelativePath(filePath);

        // Remove file cache
        delete this.files[normalizedPath];

        // Remove cross-file edges involving this file
        this.crossFileEdges = this.crossFileEdges.filter(
            e => e.sourceFile !== normalizedPath && e.targetFile !== normalizedPath
        );

        this.scheduleSave();
    }

    /**
     * Clear all cache