Improve batch worker error log serialization and test assertions

[cmraible]

Summary

• Updated batch worker error logging to use Pino's err field so error message and stack are serialized in structured logs
• Added a reusable in-memory log capture utility for tests at test/utils/log-capture.ts
• Migrated batch worker unit tests to assert emitted log output instead of logger spy calls, including error serialization checks

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[ErisDS]

🤖 Velo CI Failure Analysis

Classification: 🟠 SOFT FAIL

• Workflow: CI
• Failed Step: Lint & Test
• Run: View failed run
  What failed: Test assertion failure in UserSignatureService.test.ts
  Why: The root cause is a test assertion failure in the UserSignatureService.test.ts file. This is a code issue, as the test is failing due to an issue in the application code, not an infrastructure problem.
  Action:
  The author should investigate the failing test case and fix the underlying issue in the UserSignatureService implementation.

[cmraible]

we should log the whole error here, not just the error message.

[cmraible]

Let's rename error to err, so we can just pass it in the object as-is