Every-10-min cadence introduced in PR #159 increased Security Auditor
from 2 runs/day to 144 runs/day (144x). Combined with PM, Research Lead,
Dev Lead, and other hourly evolution-lever crons, this is the likely
root cause of the P0 OAuth quota exhaustion (#160, resets Apr 17 23:00 UTC).
Restored: cron_expr 7 6,18 * * * (twice daily, 12-hour interval)
Schedule name updated to match new cadence.
Audit prompt content (DAST teardown, PM routing, PM deliverable) retained.
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