Heartbeat State Template

Use this file as the baseline for `~/self-improving/heartbeat-state.md`. It stores only lightweight run markers and maintenance notes.

```markdown

Self-Improving Heartbeat State

last_heartbeat_started_at: never last_reviewed_change_at: never last_heartbeat_result: never

none yet

```

update `last_heartbeat_started_at` at the beginning of every heartbeat

update `last_reviewed_change_at` only after a clean review of changed files

keep `last_actions` short and factual

never turn this file into another memory log