Goal#

Add tests for small reusable lib modules (pure functions, easy to test):

# Find all lib/*.ts files NOT referenced in any test file
find lib/ -name "*.ts" | while read f; do
  base=$(basename "$f" .ts)
  if ! ls __tests__/*${base}* 2>/dev/null >/dev/null; then
    echo "$f"
  fi
done

Focus particularly on:

• lib/toast.ts — toast notification system (has test file toast.test.ts, verify coverage)
• lib/benchmark-runner.ts — already in task t-3566
• lib/backup-sync.ts actions submodule — already in task t-3567

Also check for any other lib/ files missed:

• Any lib/ files not caught by previous tasks

Acceptance#

• All lib/*.ts files have at least basic test coverage >=80%
• @area annotation: "Core Infrastructure"
• Run npm run test:coverage to verify no regressions

Tags#

[lib, coverage, utilities]