_launch_candidate() starts backend_server against a COPY of the prod db for
health-checking only; without --disable-reconciliation-loop it would find
resumable tasks in that copy and dispatch real claude -p calls before Deploy
Supervisor decides whether the candidate is even good. Adds the flag plus a
mocked-Popen regression test (LaunchCandidateArgsTest) so a future regression
here fails fast instead of surfacing as a hang or a real incident.
Also folds this into docs/todo/scheduler-production-polling-loop-design.md
(§6.1) as part of the FR-2 design record.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
