Extend discovery coverage across consumer workflows

examples/consumers/sequence_catalog.go

@@ -31,13 +31,23 @@ type SequenceCatalogEntry struct {
 	Credential  configkit.Secret `yaml:"credential"`
 }
 
-// LoadSequenceCatalog assembles imported main fragments over a file-backed
-// underlay, applies one selected collection overlay, then resolves and validates
-// the resulting application configuration.
+// LoadSequenceCatalog searches its caller-selected main path before a custom
+// fallback directory, assembles imported fragments over a file-backed underlay,
+// applies one selected collection overlay, then resolves and validates once.
 func LoadSequenceCatalog(mainPath, overlayName, runLabel string) (*configkit.Result[SequenceCatalogConfig], error) {
-	root := filepath.Dir(mainPath)
+	absoluteMain, err := filepath.Abs(mainPath)
+	if err != nil {
+		return nil, err
+	}
+	root := filepath.Dir(absoluteMain)
 	filesystem := configkit.NewFilesystem("sequence catalog", os.DirFS(root))
 	filesystemContext := &configkit.FilesystemContext{BaseDir: ".", Root: ".", FS: &filesystem}
+	mainSearch := configkit.SearchConfig("", configkit.Searches(
+		configkit.Paths(absoluteMain),
+		configkit.SearchDirectory(filepath.Join(root, "fallback"), configkit.DirectorySearchOptions{
+			Filenames: []configkit.FilenameGroup{configkit.CustomFilenames(filepath.Base(absoluteMain))},
+		}),
+	), configkit.SearchOptions{Required: true})
 	definition := configkit.Definition[SequenceCatalogConfig]{
 		SequenceIdentities: []configkit.SequenceIdentity{
 			configkit.SequenceIdentityAt(configkit.Keys("prompts"), "id"),
@@ -51,8 +61,9 @@ func LoadSequenceCatalog(mainPath, overlayName, runLabel string) (*configkit.Res
 		Validate: validateSequenceCatalog,
 	}
 	return configkit.LoadLayered(configkit.Input{
-		Source:  filesystem.File(filepath.Base(mainPath)),
-		Imports: true,
+		Source:     mainSearch,
+		Imports:    true,
+		Filesystem: &configkit.FilesystemContext{Root: root},
 	}, configkit.LayeredOptions[SequenceCatalogConfig]{
 		Underlays: []configkit.Underlay{{Inputs: []configkit.Input{{
 			Source: filesystem.File("underlay.yml"),