Review response: Confirm null userId validation and test coverage added

[Copilot]

User requested review of changes made since initial bot feedback. Both previously identified issues have been addressed in subsequent commits.

Changes Verified

• Null userId validation: Added explicit null check with 400 error response before calling register(), preventing NullPointerException

  val userId: String? = context.get<String>(TOCK_USER_ID) ?: context.queryParams()[USER_ID_QUERY_PARAM]
  if (userId != null) {
      channels.register(context.response(), connectorId, userId)
  } else {
      context.fail(400, NullPointerException("missing userId in request"))
  }

• Test coverage: Added SseEndpointTest.kt with 5 test cases covering SSE connection flow, null userId rejection, security handler integration, offline message handling, and concurrent connections

No additional code changes were required—previous commits already addressed all feedback.

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