eve adds new Slack event hooks and session control features

New features have been added to allow the eve agent to interact more naturally within Slack. Now the agent can continue conversations within threads without repeated mentions, and can cancel an in-progress response or fully reset a conversation session.

The key updates are as follows:

• Improved conversation continuity: Through the onMessage hook and the ctx.isSubscribed() helper, the agent can automatically respond without a mention in threads where an active session exists.
• Session control features: You can use ctx.cancel() to stop the current response and wait for new input, or use ctx.reset() to completely clear the conversation history and state and start a new session.
• Support for the Events API: Through the new onEvent hook, you can detect and respond to various Slack events such as reaction_added and team_join. For example, you could send onboarding messages simultaneously to multiple channels when a team_join event occurs.