fix: preserve failed batch job ids

[itzptk]

Summary

• preserve the failed job event ID in batch item results instead of replacing it with a new UUID
• route each batch item through a per-item sink that captures failed events while preserving callback binding
• add regression coverage for failed upgradeMany, uninstallMany, and pinMany items

Verification

• npm run test:node -- electron/services/homebrew-service.test.ts --testNamePattern "preserves failed item job IDs"
• npm run test:node -- electron/services/homebrew-service.test.ts
• npm run test:all
• npm run build
• independent pre-commit review passed after fixes

Closes #5