[FEATURE] Implement Heartbeat to wakeup the agent on a set of interval

[edenreich]

Summary

This should be a feature flag.

When the user enables it the agent can be woken once in a while on a configured interval and check for things to do.

Perhaps also a separate system prompt is needed for when the agent is waking up to make it more granular - this system prompt should be also configurable.

Acceptance Criteria

• The agent is waking up on a configured interval and checking for todos
• This feature is behind a feature flag - disabled by default
• Heartbeat is on a separate config, like channels.yaml for example
• Heartbeat is generated with init command
• It's documented
• It's tested

[ig-semantic-release-bot]

🎉 This issue has been resolved in version 0.108.0 🎉

The release is available on GitHub release

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