Fix nagging for doses not yet due — check scheduled time before nagging

should_send_nag() was iterating all pending schedules for today without
verifying the scheduled time had actually passed. A dose scheduled for
18:00 would get nagged at 13:15. Add an early return when current_time
is before the scheduled dose time.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/adaptive_meds.py

@@ -245,6 +245,13 @@ def should_send_nag(
     """
     scheduled_time = _normalize_time(scheduled_time)
 
+    # Don't nag for doses that aren't due yet
+    if scheduled_time:
+        sched_hour, sched_min = int(scheduled_time[:2]), int(scheduled_time[3:5])
+        sched_as_time = time(sched_hour, sched_min)
+        if current_time.time() < sched_as_time:
+            return False, "Not yet due"
+
     settings = get_adaptive_settings(user_uuid)
     if not settings:
         return False, "No settings"