# 005 — Election Heartbeat on Admin Transition

- Area: `main.go`, `pkg/election/*`
- Priority: Medium

## Background
Heartbeat loop starts only if this node is admin at startup. When admin changes via callback, role config is applied but no new heartbeat loop is launched. Risk: missed heartbeats post-takeover.

## Scope / Deliverables
- Start/stop admin heartbeat within the election callback based on current winner.
- Ensure single heartbeat goroutine per admin node; cleanly stop on demotion/shutdown.
- Log state transitions and errors.

## Acceptance Criteria / Tests
- In tests/sim, when admin role transfers, the new admin begins heartbeating within `HeartbeatTimeout/2`.
- No duplicate heartbeats; demoted node stops sending heartbeats.

## Notes
- Consider encapsulating heartbeat management inside `ElectionManager`.