parseHeartbeat now reads an optional model= line from the heartbeat
file (written by native runtime heartbeats) into HeartbeatInfo.model,
and fleet ps surfaces it as a MODEL column (table) and in --json
(via rows[].heartbeat.model). Legacy/sidecar heartbeats omit the line
and report model=null, so the column shows '-'.
Closes the model self-report gap end-to-end with the native Pi
heartbeat writer (F3-m2): the runtime self-reports its active model
and the fleet operator can see it in ps.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EsgTQzV5YUGk1JtCLP4B83
Jason Woltje
bda38bddc1