Verified US-021 acceptance criteria:
- checkHeartbeat() calls hs.executeHeartbeatWithTools(prompt) ✓
- ProcessHeartbeat function does not exist (already deleted) ✓
- Typecheck passes (go build ./... succeeds) ✓
Note: US-020 and US-021 were already implemented in previous commits.
The checkHeartbeat function prioritizes the new tool-supporting handler
(hs.onHeartbeatWithTools) over the legacy handler (hs.onHeartbeat).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
be81ba1f30