Follow package conventions, add regression tests, and fully verify changes

For getsentry/craft, use the Volta-pinned Node 24.18.0 and pnpm 10.27.0 exclusively; never use npm or Yarn. Install with pnpm install --frozen-lockfile, build with pnpm build (dist/craft), test with pnpm test, lint with pnpm lint, fix with pnpm fix, and manually validate with pnpm build && ./dist/craft. Other package managers bypass the committed pnpm lockfile and cause resolution churn. Add focused regressions, iterate with focused tests, then run applicable full tests, typecheck, lint, formatting, generated-file, and docs checks; inspect final diffs and report blockers.