Wake the scheduler on plan and dinner changes (MQ-177-01)

A swap, stored draft, or dinner method/minutes change (edit or grounding)
now calls Scheduler.Wake once committed, so a crock-pot dinner swapped in
for tonight is reminded at start_by minus 15 minutes rather than at the
next hourly pass. Adds a fake-clock test that swaps in a crock-pot
Quest-log dinner at 09:01 and asserts the start reminder at 09:15, once.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/dinners/grounding.go

@@ -196,6 +196,7 @@ func (s *Service) runGroundJob(ctx context.Context, p GroundJob, _ func(groundRe
 	if n == 0 {
 		return s.currentGrounding(ctx, row.ID)
 	}
+	s.wake()
 	return groundResult{DinnerID: row.ID, GroundingStatus: GroundingGrounded}, nil
 }
 
@@ -577,6 +578,7 @@ func (s *Service) Ground(ctx context.Context, id string, f Fix, updatedBy string
 	if err != nil {
 		return Dinner{}, fmt.Errorf("%w: dinner %s: record: %w", ErrGroundFailed, id, err)
 	}
+	s.wake()
 	s.clearOffers(cur.ID, math.MaxInt64)
 	return fromRow(row), nil
 }
@@ -700,6 +702,7 @@ func (s *Service) groundManual(ctx context.Context, id string, m ManualRecipe, u
 	if err != nil {
 		return Dinner{}, fmt.Errorf("%w: dinner %s: %w", ErrGroundFailed, id, err)
 	}
+	s.wake()
 	s.clearOffers(row.ID, math.MaxInt64)
 	return fromRow(row), nil
 }