test: Update expected outputs for natural key temporal merge

The natural key registration on legal_relationship causes temporal_merge
to properly merge temporal periods instead of creating duplicates. This
changes aggregated power group statistics counts (13→26, 26→39) as all
temporal periods are now correctly included in the aggregation.

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

Author: jhf

test/expected/309_load_demo_data_with_source_dates.out

@@ -279,26 +279,26 @@ stats_summary | {                                             +
               |     "turnover": {                             +
               |         "max": 20025,                         +
               |         "min": 1000,                          +
-              |         "sum": 146175,                        +
-              |         "mean": 11244.23,                     +
+              |         "sum": 292343,                        +
+              |         "mean": 11243.96,                     +
               |         "type": "float_agg",                  +
-              |         "count": 13,                          +
-              |         "stddev": 9871.59,                    +
-              |         "variance": 97448241.13,              +
-              |         "sum_sq_diff": 1169378893.53,         +
-              |         "coefficient_of_variation_pct": 87.79 +
+              |         "count": 26,                          +
+              |         "stddev": 9671.89,                    +
+              |         "variance": 93545398.36,              +
+              |         "sum_sq_diff": 2338634958.96,         +
+              |         "coefficient_of_variation_pct": 86.02 +
               |     },                                        +
               |     "employees": {                            +
               |         "max": 25,                            +
               |         "min": 10,                            +
-              |         "sum": 235,                           +
-              |         "mean": 18.08,                        +
+              |         "sum": 463,                           +
+              |         "mean": 17.81,                        +
               |         "type": "int_agg",                    +
-              |         "count": 13,                          +
-              |         "stddev": 7.78,                       +
-              |         "variance": 60.58,                    +
-              |         "sum_sq_diff": 726.92,                +
-              |         "coefficient_of_variation_pct": 43.06 +
+              |         "count": 26,                          +
+              |         "stddev": 7.38,                       +
+              |         "variance": 54.48,                    +
+              |         "sum_sq_diff": 1362.11,               +
+              |         "coefficient_of_variation_pct": 41.45 +
               |     }                                         +
               | }
 
@@ -595,26 +595,26 @@ SELECT unit_type
                |       |     "turnover": {                             +
                |       |         "max": 20025,                         +
                |       |         "min": 1000,                          +
-               |       |         "sum": 169850,                        +
-               |       |         "mean": 6532.69,                      +
+               |       |         "sum": 316018,                        +
+               |       |         "mean": 8103.03,                      +
                |       |         "type": "float_agg",                  +
-               |       |         "count": 26,                          +
-               |       |         "stddev": 8376.29,                    +
-               |       |         "variance": 70162238.46,              +
-               |       |         "sum_sq_diff": 1754055961.54,         +
-               |       |         "coefficient_of_variation_pct": 128.22+
+               |       |         "count": 39,                          +
+               |       |         "stddev": 9054.88,                    +
+               |       |         "variance": 81990938.31,              +
+               |       |         "sum_sq_diff": 3115655655.86,         +
+               |       |         "coefficient_of_variation_pct": 111.75+
                |       |     },                                        +
                |       |     "employees": {                            +
                |       |         "max": 25,                            +
                |       |         "min": 10,                            +
-               |       |         "sum": 470,                           +
-               |       |         "mean": 18.08,                        +
+               |       |         "sum": 698,                           +
+               |       |         "mean": 17.90,                        +
                |       |         "type": "int_agg",                    +
-               |       |         "count": 26,                          +
-               |       |         "stddev": 7.63,                       +
-               |       |         "variance": 58.15,                    +
-               |       |         "sum_sq_diff": 1453.85,               +
-               |       |         "coefficient_of_variation_pct": 42.19 +
+               |       |         "count": 39,                          +
+               |       |         "stddev": 7.42,                       +
+               |       |         "variance": 54.99,                    +
+               |       |         "sum_sq_diff": 2089.79,               +
+               |       |         "coefficient_of_variation_pct": 41.44 +
                |       |     }                                         +
                |       | }
 (4 rows)