=== ROUTER STEP FACTS CONTRACT VALIDATION ===
step=STEP_044S_ACTIVITY_SAMPLER_SYSTEMD_ENABLE_AND_OBSERVE
decision=PASS
all_ok=True
structure_ok=True
success_ok=True
expected_absence_ok=True
blockers_ok=True
success_checks_count=51
expected_absence_count=10

warnings:
  - STEP_044S enables and starts the sampler timer; this is an intentional persistent router-ops change.
  - The timer run intentionally executes sampler --apply. With no new traffic, baselines remain aligned and post dry-run delta is zero.
  - Rollback script disables/stops the timer only; it does not remove unit files from STEP_044R.