The operational _start_fleet.sh lives in a local (untracked) sandbox, so the
gate + heartbeat-cadence settings weren't version-controlled anywhere. Add
demo/start-fleet.example.sh: a parameterized, sanitized launcher (one
agent-queue.sh run daemon per product against a live platform-service) that
ships the two settings you must get right — AQ_FLEET_GATE=1 (M0 RU gate) and
AQ_FLEET_LEASE_RENEW_SEC=30 (heartbeat cadence < the 90s stale threshold). No
hardcoded paths/secrets; everything env-overridable. Documented in demo/README.
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
