replaced explicit masterfeats/feat base+lock path branches

TOPDATA_HARDENING_CONTRACT.md

@@ -146,6 +146,9 @@ This should be test-covered.
 
 ### Work Item 2: Audit path-based validator routing
 
+Status: implemented for root dataset invariants; family-specific routes remain
+where the authored shape is not a generic base/module/lock file.
+
 Classify every explicit route in `validateDataObject()` as one of:
 
 - generic canonical shape handling
@@ -154,6 +157,21 @@ Classify every explicit route in `validateDataObject()` as one of:
 
 Reduce the explicit route set where possible.
 
+Current classification:
+
+- `masterfeats/base.json`, `masterfeats/lock.json`, `feat/base.json`, and
+  `feat/lock.json` are now handled by a generic dataset invariant table. These
+  remain toolkit invariants because the row key namespaces and required columns
+  are intrinsic to those native datasets, not repository-level YAML choices.
+- `feat/generated/*` remains an intrinsic dataset-family route. Generated feat
+  files support compact family expansion and generated entries/overrides, which
+  are not generic module shapes.
+- `parts/overrides/*` remains a dataset-family route for non-module override
+  files outside the standard `modules/` tree.
+- `racialtypes/registry/races/*` remains a registry-family route because those
+  files describe race registry records, optional feat-table generation, and core
+  row payloads rather than generic row/module documents.
+
 ### Work Item 3: Define topdata invariant boundaries
 
 For each current explicit topdata behavior, decide whether it belongs in:

internal/topdata/topdata.go

@@ -383,22 +383,17 @@ func validateDataObject(path string, obj map[string]any, report *ValidationRepor
 	base := filepath.Base(path)
 	slashed := filepath.ToSlash(path)
 	inModules := strings.Contains(slashed, "/modules/")
+	dataPath := parseTopdataDataPath(path)
 
-	if strings.HasSuffix(slashed, "/data/masterfeats/base.json") {
+	if invariant, ok := datasetInvariantForPath(dataPath); ok {
-		validateMasterfeatsBaseFile(path, obj, report)
+		if dataPath.IsRootBase {
+			validateDatasetInvariantBaseFile(path, obj, invariant, report)
 			return
 		}
-	if strings.HasSuffix(slashed, "/data/masterfeats/lock.json") {
+		if dataPath.IsRootLock {
-		validateMasterfeatsLockFile(path, obj, report)
+			validateDatasetInvariantLockFile(path, obj, invariant, report)
 			return
 		}
-	if strings.HasSuffix(slashed, "/data/feat/base.json") {
-		validateFeatBaseFile(path, obj, report)
-		return
-	}
-	if strings.HasSuffix(slashed, "/data/feat/lock.json") {
-		validateFeatLockFile(path, obj, report)
-		return
 	}
 	if strings.Contains(slashed, "/data/feat/generated/") {
 		validateFeatGeneratedFile(path, obj, report)
@@ -454,21 +449,85 @@ func validateDataObject(path string, obj map[string]any, report *ValidationRepor
 	})
 }
 
-func validateMasterfeatsBaseFile(path string, obj map[string]any, report *ValidationReport) {
+type topdataDataPath struct {
-	validateRowsFile(path, obj, report, true)
+	Segments   []string
-	validateDerivedBaseOutput(path, obj, "masterfeats", report)
+	IsRootBase bool
+	IsRootLock bool
+}
 
+func parseTopdataDataPath(path string) topdataDataPath {
+	slashed := filepath.ToSlash(path)
+	marker := "/data/"
+	index := strings.LastIndex(slashed, marker)
+	if index == -1 {
+		return topdataDataPath{}
+	}
+	rel := strings.Trim(slashed[index+len(marker):], "/")
+	if rel == "" {
+		return topdataDataPath{}
+	}
+	segments := strings.Split(rel, "/")
+	return topdataDataPath{
+		Segments:   segments,
+		IsRootBase: len(segments) == 2 && segments[1] == "base.json",
+		IsRootLock: len(segments) == 2 && segments[1] == "lock.json",
+	}
+}
+
+type datasetValidationInvariant struct {
+	Name            string
+	KeyPrefix       string
+	RequiredColumns []string
+}
+
+var datasetValidationInvariants = map[string]datasetValidationInvariant{
+	"feat": {
+		Name:      "feat",
+		KeyPrefix: "feat:",
+	},
+	"masterfeats": {
+		Name:            "masterfeats",
+		KeyPrefix:       "masterfeats:",
+		RequiredColumns: []string{"LABEL", "STRREF", "DESCRIPTION"},
+	},
+}
+
+func datasetInvariantForPath(dataPath topdataDataPath) (datasetValidationInvariant, bool) {
+	if len(dataPath.Segments) == 0 {
+		return datasetValidationInvariant{}, false
+	}
+	invariant, ok := datasetValidationInvariants[dataPath.Segments[0]]
+	return invariant, ok
+}
+
+func validateDatasetInvariantBaseFile(path string, obj map[string]any, invariant datasetValidationInvariant, report *ValidationReport) {
+	validateRowsFile(path, obj, report, true)
+	validateDerivedBaseOutput(path, obj, invariant.Name, report)
+	validateRequiredColumns(path, obj, invariant, report)
+	validateRowsKeyPrefix(path, obj, invariant, report)
+}
+
+func validateRequiredColumns(path string, obj map[string]any, invariant datasetValidationInvariant, report *ValidationReport) {
+	if len(invariant.RequiredColumns) == 0 {
+		return
+	}
 	columns := extractValidationColumns(obj)
-	for _, required := range []string{"LABEL", "STRREF", "DESCRIPTION"} {
+	for _, required := range invariant.RequiredColumns {
-		if _, ok := canonicalColumn(columns, required); !ok {
+		if _, ok := canonicalColumn(columns, required); ok {
+			continue
+		}
 		report.Diagnostics = append(report.Diagnostics, Diagnostic{
 			Severity: SeverityError,
 			Path:     path,
-				Message:  fmt.Sprintf("masterfeats base.json must include %s in columns", required),
+			Message:  fmt.Sprintf("%s base.json must include %s in columns", invariant.Name, required),
 		})
 	}
-	}
+}
 
+func validateRowsKeyPrefix(path string, obj map[string]any, invariant datasetValidationInvariant, report *ValidationReport) {
+	if invariant.KeyPrefix == "" {
+		return
+	}
 	rows, ok := obj["rows"].([]any)
 	if !ok {
 		return
@@ -482,34 +541,32 @@ func validateMasterfeatsBaseFile(path string, obj map[string]any, report *Valida
 		if !ok || strings.TrimSpace(key) == "" {
 			continue
 		}
-		if !strings.HasPrefix(key, "masterfeats:") {
+		if !strings.HasPrefix(key, invariant.KeyPrefix) {
 			report.Diagnostics = append(report.Diagnostics, Diagnostic{
 				Severity: SeverityError,
 				Path:     path,
-				Message:  fmt.Sprintf("masterfeats row %d key %q must start with masterfeats:", index, key),
+				Message:  fmt.Sprintf("%s row %d key %q must start with %s", invariant.Name, index, key, invariant.KeyPrefix),
 			})
 		}
 	}
 }
 
-func validateMasterfeatsLockFile(path string, obj map[string]any, report *ValidationReport) {
+func validateDatasetInvariantLockFile(path string, obj map[string]any, invariant datasetValidationInvariant, report *ValidationReport) {
 	validateLockObject(path, obj, report)
+	if invariant.KeyPrefix == "" {
+		return
+	}
 	for key := range obj {
-		if !strings.HasPrefix(key, "masterfeats:") {
+		if !strings.HasPrefix(key, invariant.KeyPrefix) {
 			report.Diagnostics = append(report.Diagnostics, Diagnostic{
 				Severity: SeverityError,
 				Path:     path,
-				Message:  fmt.Sprintf("masterfeats lock key %q must start with masterfeats:", key),
+				Message:  fmt.Sprintf("%s lock key %q must start with %s", invariant.Name, key, invariant.KeyPrefix),
 			})
 		}
 	}
 }
 
-func validateFeatBaseFile(path string, obj map[string]any, report *ValidationReport) {
-	validateRowsFile(path, obj, report, true)
-	validateDerivedBaseOutput(path, obj, "feat", report)
-}
-
 func validateDerivedBaseOutput(path string, obj map[string]any, datasetLabel string, report *ValidationReport) {
 	if output, ok := obj["output"]; !ok {
 		return
@@ -522,19 +579,6 @@ func validateDerivedBaseOutput(path string, obj map[string]any, datasetLabel str
 	}
 }
 
-func validateFeatLockFile(path string, obj map[string]any, report *ValidationReport) {
-	validateLockObject(path, obj, report)
-	for key := range obj {
-		if !strings.HasPrefix(key, "feat:") {
-			report.Diagnostics = append(report.Diagnostics, Diagnostic{
-				Severity: SeverityError,
-				Path:     path,
-				Message:  fmt.Sprintf("feat lock key %q must start with feat:", key),
-			})
-		}
-	}
-}
-
 func validateFeatGeneratedFile(path string, obj map[string]any, report *ValidationReport) {
 	family, ok := obj["family"].(string)
 	if !ok || strings.TrimSpace(family) == "" {

internal/topdata/topdata_test.go

@@ -79,6 +79,41 @@ func TestValidateAndBuildDerivesFeatOutputWhenOmitted(t *testing.T) {
 	}
 }
 
+func TestValidateProjectRejectsInvalidFeatInvariantContract(t *testing.T) {
+	root := testProjectRoot(t)
+	mkdirAll(t, filepath.Join(root, "topdata", "data", "feat"))
+	writeFile(t, filepath.Join(root, "topdata", "base_dialog.json"), "{}\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "feat", "base.json"), `{
+  "output": "masterfeats.2da",
+  "columns": ["LABEL", "FEAT", "DESCRIPTION"],
+  "rows": [
+    {
+      "id": 0,
+      "key": "masterfeats:test",
+      "LABEL": "FEAT_TEST",
+      "FEAT": "100",
+      "DESCRIPTION": "200"
+    }
+  ]
+}`+"\n")
+	writeFile(t, filepath.Join(root, "topdata", "data", "feat", "lock.json"), `{"masterfeats:test":0}`+"\n")
+
+	report := ValidateProject(testProject(root))
+	if !report.HasErrors() {
+		t.Fatal("expected validation errors for invalid feat invariants")
+	}
+	text := diagnosticsText(report.Diagnostics)
+	for _, want := range []string{
+		"feat output must be feat.2da",
+		`feat row 0 key "masterfeats:test" must start with feat:`,
+		`feat lock key "masterfeats:test" must start with feat:`,
+	} {
+		if !strings.Contains(text, want) {
+			t.Fatalf("expected validation message %q, got:\n%s", want, text)
+		}
+	}
+}
+
 func TestValidateProjectRejectsDuplicateJSONKeys(t *testing.T) {
 	root := testProjectRoot(t)
 	mkdirAll(t, filepath.Join(root, "topdata", "data", "repadjust"))