Bot Status, Stock, and Order Update Events

[DakotaCondos]

As the Robot Data Ingestion System,
I want robot-related update events to be published when bot state changes,
so that external systems can track bot status, stock availability, order responses, and delivery completion.

Acceptance Criteria

• Given a bot status changes
  When the change occurs
  Then the bot generates a status update event.

• Given a bot reserves stock
  When an order is accepted or queued
  Then the bot generates a stock update event.

• Given a bot rejects an order
  When validation fails
  Then the bot generates an order rejected event with a reason.

• Given a bot completes an order
  When delivery is finalized
  Then the bot generates an order completion event.

• Given the bot completes an order and immediately starts a queued order
  When status events are generated
  Then the bot should not incorrectly report itself as Available.