Bug fixes:
- Empty result field handling: Changed truthy check to explicit type
check (`typeof parsed?.text === "string"`) in command-reply.ts.
Previously, Claude CLI returning `result: ""` would cause raw JSON
to be sent to WhatsApp.
- Response prefix on heartbeat: Apply `responsePrefix` to heartbeat
alert messages in runReplyHeartbeat, matching behavior of regular
message handler.
Peter Steinberger
c5ab442f46