Function getGitChangedFiles

src/extraction/index.ts:833–844

* Use `git status` to detect changed files instead of scanning every file. * Returns null on failure so callers fall back to full scan. * * Recurses into embedded repos — the untracked kind (#193: the parent's status * collapses them to an opaque `?? subdir/` entry) always, and the gitignored *

(rootDir: string)

 * with it); a full `codegraph index` reconciles that.
 */
function getGitChangedFiles(rootDir: string): GitChanges | null {
  try {
    const changes: GitChanges = { modified: [], added: [], deleted: [] };
    // Custom extension → language overrides from the project's codegraph.json,
    // so change detection sees the same custom-extension files the full index does.
    const overrides = loadExtensionOverrides(rootDir);
    collectGitStatus(rootDir, '', changes, overrides, loadIncludeIgnoredMatcher(rootDir), loadExcludeMatcher(rootDir));
    return changes;
  } catch {
    return null;
  }
}

function collectGitStatus(repoDir: string, prefix: string, out: GitChanges, overrides?: Record<string, Language>, includeIgnored: Ignore | null = null, exclude: Ignore | null = null): void {
  const output = execFileSync(