Handle missing assets/ directory in asset validation workflow

[Copilot]

The Validate SVGs and Metadata Action was failing with ENOENT when scripts/validate-assets.mjs attempted to scan assets/ in branches/commits where that directory is absent. This change makes the validator resilient to missing asset roots while preserving existing validation behavior when assets are present.

• Root cause

  • Recursive discovery always called findFiles(assetsDir, ...) without checking whether assetsDir exists.

• Change

  • Added an existence guard before recursive asset discovery.
  • If assets/ is missing, the script now follows its existing no-op path (Nothing to validate) instead of throwing.

• Scope

  • Single-file change in scripts/validate-assets.mjs; no workflow or schema changes.

import { existsSync, readdirSync } from "node:fs";

if (args.length === 0) {
  if (existsSync(assetsDir)) {
    svgFiles.push(...findFiles(assetsDir, (f) => f.endsWith(".svg")));
    metaFiles.push(...findFiles(assetsDir, (f) => f.endsWith("metadata.json")));
  }
}