Fix base parts not generating

README.md

@@ -182,7 +182,6 @@ generated_assets:
           kind: trailing_numeric_suffix
           group_from: first_path_segment
         parts_rows:
-          null_undiscovered_rows: true
           row_defaults:
             COSTMODIFIER: "0"
           acbonus:
@@ -274,11 +273,11 @@ ACBONUS values before module overrides are applied. The
 IDs so higher part rows can sort before lower rows in the toolset; the legacy
 `descending_row_id_sort_key` strategy remains available for repositories that
 already depend on it. Per-dataset policies such as `chest: fixed 0.00` can
-override the default. When `null_undiscovered_rows` is true, authored part rows
+override the default. Authored source ACBONUS values are not authoritative when
-without discovered model IDs are omitted from the collected row set so dense
+this policy is configured, except that authored `****` values remain null
-2DA output writes them as `****` null rows. Authored source ACBONUS values are
+unless model discovery activates the row. Dense gaps without authored rows or
-not authoritative when this policy is configured; files under `parts/modules`
+discovered part models are emitted as `****` null rows. Files under
-remain the final override layer.
+`parts/modules` remain the final override layer.
 
 Extraction is deliberately guarded because it writes source files from binary
 archives. `extract.archives` is a list of glob patterns relative to

internal/pipeline/pipeline_test.go

@@ -2248,7 +2248,6 @@ func TestBuildHAKsGeneratesParts2DAAssetsFromLocalModels(t *testing.T) {
             "group_from": "first_path_segment"
           },
           "parts_rows": {
-            "null_undiscovered_rows": true,
             "row_defaults": {"COSTMODIFIER": "0"},
             "acbonus": {
               "default": {
@@ -2285,6 +2284,7 @@ func TestBuildHAKsGeneratesParts2DAAssetsFromLocalModels(t *testing.T) {
   "rows": [
     {"id": 0, "COSTMODIFIER": 1, "ACBONUS": "0.25"},
     {"id": 17, "COSTMODIFIER": 0, "ACBONUS": "0.90"},
+    {"id": 19, "COSTMODIFIER": 0, "ACBONUS": "****"},
     {"id": 117, "COSTMODIFIER": 0, "ACBONUS": "****"}
   ]
 }
@@ -2327,7 +2327,13 @@ func TestBuildHAKsGeneratesParts2DAAssetsFromLocalModels(t *testing.T) {
 		t.Fatalf("read generated parts 2da: %v", err)
 	}
 	partsText := string(partsRaw)
-	for _, want := range []string{"0\t****\t****", "17\t****\t****", "18\t0\t0.75", "117\t0\t1.17"} {
+	for _, want := range []string{
+		"0\t1\t0.00",
+		"17\t0\t0.17",
+		"18\t0\t0.75",
+		"19\t****\t****",
+		"117\t0\t1.17",
+	} {
 		if !strings.Contains(partsText, want) {
 			t.Fatalf("expected generated parts 2da to contain %q after normalization and overrides, got:\n%s", want, partsText)
 		}

internal/project/project.go

@@ -297,7 +297,6 @@ type AutogenConsumerConfig struct {
 }
 
 type PartsRowsConfig struct {
-	NullUndiscoveredRows bool                              `json:"null_undiscovered_rows" yaml:"null_undiscovered_rows"`
 	RowDefaults map[string]string                 `json:"row_defaults" yaml:"row_defaults"`
 	ACBonus     PartsRowsACBonusConfig            `json:"acbonus" yaml:"acbonus"`
 	Datasets    map[string]PartsRowsDatasetConfig `json:"datasets" yaml:"datasets"`
@@ -1396,9 +1395,6 @@ func validateGeneratedConfig(cfg GeneratedConfig) []error {
 }
 
 func partsRowsConfigConfigured(cfg PartsRowsConfig) bool {
-	if cfg.NullUndiscoveredRows {
-		return true
-	}
 	if len(cfg.RowDefaults) > 0 {
 		return true
 	}

internal/project/project_test.go

@@ -907,44 +907,6 @@ func TestValidateLayoutAcceptsGeneratedTopData2DAConfig(t *testing.T) {
 	}
 }
 
-func TestValidateLayoutAcceptsGeneratedPartsRowsNullUndiscoveredWithoutACBonusPolicy(t *testing.T) {
-	root := t.TempDir()
-	mkdirAll(t, filepath.Join(root, "assets"))
-	mkdirAll(t, filepath.Join(root, "build"))
-	proj := Project{
-		Root: root,
-		Config: Config{
-			Module: ModuleConfig{Name: "Test", ResRef: "testmod"},
-			Paths:  PathConfig{Assets: "assets"},
-			Generated: GeneratedConfig{
-				TopData2DA: []GeneratedTopData2DAConfig{
-					{
-						ID:              "parts",
-						Source:          "topdata",
-						Output:          "{paths.cache}/generated-assets/parts-2da",
-						IncludeDatasets: []string{"parts/**"},
-						PackageRoot:     "part",
-						Autogen: AutogenConsumerConfig{
-							ID:      "parts",
-							Mode:    "parts_rows",
-							Root:    "part",
-							Include: []string{"**/*.mdl"},
-							Derive:  AutogenDeriveConfig{Kind: "trailing_numeric_suffix", GroupFrom: "first_path_segment"},
-							PartsRows: PartsRowsConfig{
-								NullUndiscoveredRows: true,
-							},
-						},
-					},
-				},
-			},
-		},
-	}
-
-	if err := proj.ValidateLayout(); err != nil {
-		t.Fatalf("ValidateLayout returned error: %v", err)
-	}
-}
-
 func TestValidateLayoutRejectsEscapingGeneratedTopData2DAConfig(t *testing.T) {
 	root := t.TempDir()
 	mkdirAll(t, filepath.Join(root, "assets"))

internal/topdata/AUTO-INCLUDE_EXISTING_PART_MODELS_IN_2DA_GENERATION_CONTRACT.md

@@ -136,11 +136,13 @@ The superseded implementation was correct only if all of the following were true
    - `COSTMODIFIER = 0`
    - `ACBONUS = 0.00`
 
-6. When configured, rows without discovered models are emitted as dense null
+6. Authored base rows remain exposed. Authored `ACBONUS = ****` rows remain
+   null unless model discovery activates the row.
+7. Dense gaps without authored rows or discovered models are emitted as null
    rows with `COSTMODIFIER = ****` and `ACBONUS = ****`.
-7. File overrides are applied after discovery and take precedence.
+8. File overrides are applied after discovery and take precedence.
-8. The final output includes all eligible existing models present in the manifest.
+9. The final output includes all eligible existing models present in the manifest.
-9. Discovery does not require a sibling local `sow-assets` checkout or a Git clone.
+10. Discovery does not require a sibling local `sow-assets` checkout or a Git clone.
 
 ---
 

internal/topdata/parts_discovery.go

@@ -474,7 +474,9 @@ func normalizePartsRowsACBonus(collected []nativeCollectedDataset, cfg project.P
 				}
 			}
 			rowID, ok := cloned["id"].(int)
-			if ok {
+			if isUnsetPartValue(cloned["ACBONUS"]) {
+				cloned["COSTMODIFIER"] = nullValue
+			} else if ok {
 				if value, configured := configuredPartsRowsACBonusValue(rowID, dataset.Dataset.Name, cfg); configured {
 					cloned["ACBONUS"] = value
 				}
@@ -663,15 +665,7 @@ func augmentWithAutogeneratedPartsWithConfig(collected []nativeCollectedDataset,
 
 		// Add rows for discovered IDs that don't already exist.
 		newRows := make([]map[string]any, 0, len(dataset.Rows))
-		for _, row := range dataset.Rows {
+		newRows = append(newRows, dataset.Rows...)
-			rowID, ok := row["id"].(int)
-			if cfg.NullUndiscoveredRows && ok {
-				if _, discovered := ids[rowID]; !discovered {
-					continue
-				}
-			}
-			newRows = append(newRows, row)
-		}
 
 		for rowID := range ids {
 			if row, exists := existingRows[rowID]; exists {

internal/topdata/topdata_test.go

@@ -10533,6 +10533,7 @@ func TestNormalizePartsRowsACBonusUsesConfiguredPolicyBeforeOverrides(t *testing
 			Rows: []map[string]any{
 				{"id": 1, "COSTMODIFIER": "5", "ACBONUS": "0.90"},
 				{"id": 999, "COSTMODIFIER": "0", "ACBONUS": "****"},
+				{"id": 1000, "COSTMODIFIER": "0", "ACBONUS": "0.00"},
 			},
 		},
 		{
@@ -10569,8 +10570,11 @@ func TestNormalizePartsRowsACBonusUsesConfiguredPolicyBeforeOverrides(t *testing
 	if got := beltRows[1]["ACBONUS"]; got != "9.98" {
 		t.Fatalf("expected authored belt ACBONUS to be replaced with computed sort key 9.98, got %v", got)
 	}
-	if got := beltRows[999]["ACBONUS"]; got != "0.00" {
+	if got := beltRows[999]["ACBONUS"]; got != "****" {
-		t.Fatalf("expected highest belt row to sort at 0.00, got %v", got)
+		t.Fatalf("expected authored null belt row to remain ****, got %v", got)
+	}
+	if got := beltRows[1000]["ACBONUS"]; got != "-0.01" {
+		t.Fatalf("expected non-null high belt row to use computed sort key, got %v", got)
 	}
 	chestRows := rowsByID(got[1].Rows)
 	if got := chestRows[14]["ACBONUS"]; got != "0.00" {
@@ -10588,8 +10592,9 @@ func TestNormalizePartsRowsACBonusSupportsAscendingRowIDSortKey(t *testing.T) {
 			Dataset: nativeDataset{Name: "parts/belt", OutputName: "parts_belt.2da"},
 			Columns: []string{"COSTMODIFIER", "ACBONUS"},
 			Rows: []map[string]any{
-				{"id": 1, "COSTMODIFIER": "0", "ACBONUS": "****"},
+				{"id": 1, "COSTMODIFIER": "0", "ACBONUS": "0.00"},
-				{"id": 117, "COSTMODIFIER": "0", "ACBONUS": "****"},
+				{"id": 117, "COSTMODIFIER": "0", "ACBONUS": "0.00"},
+				{"id": 118, "COSTMODIFIER": "0", "ACBONUS": "****"},
 			},
 		},
 	}
@@ -10611,6 +10616,9 @@ func TestNormalizePartsRowsACBonusSupportsAscendingRowIDSortKey(t *testing.T) {
 	if got := beltRows[117]["ACBONUS"]; got != "1.17" {
 		t.Fatalf("expected high belt row to get higher sort key 1.17, got %v", got)
 	}
+	if got := beltRows[118]["ACBONUS"]; got != "****" {
+		t.Fatalf("expected authored null belt row to remain ****, got %v", got)
+	}
 }
 
 func rowsByID(rows []map[string]any) map[int]map[string]any {