## heartbeat-prompt-unreadable

**What you see.** `loopd` is serving, but heartbeat turns do not run. It logs this line once,
until the file reads:

```text
loopd: heartbeat.md: Permission denied (os error 13); see docs/runbook.md#heartbeat-prompt-unreadable
```

**Why.** `[heartbeat] prompt` is next to the config file (default `heartbeat.md`). The scheduler
skips the tick rather than send an empty or guessed user message. A missing file is the same:
restore the starter from `config/heartbeat.md` in the repository.

**Confirm.**

```sh
ls -l "$(dirname "$LOOPD_CONFIG")/heartbeat.md"
```

**Fix.** Restore mode `0644` (or whatever the owner uses for the other prompts) and content.
The next tick after a successful read logs nothing extra and runs the standing `heartbeat`
session.

**Check.** `sessions/heartbeat/0.jsonl` gains a new `User` whose text starts with `It is ` and an
RFC 3339 timestamp.