diff --git a/construction_contract_test.go b/construction_contract_test.go
index e175263..bf73475 100644
--- a/construction_contract_test.go
+++ b/construction_contract_test.go
@@ -291,7 +291,7 @@ func TestBackendSourceOwnsSmokeTestValuesAndDefersDefaultLookup(t *testing.T) {
 		"https://backend.example/v1",
 		"not-yet-listed",
 		"https://probe.example/ready?check=1",
-		" OPENROUTER_KEY ",
+		"openrouter_key",
 		"https://probe.example/key?scope=current",
 	} {
 		if !strings.Contains(contents, want) {
diff --git a/docs/roadmap/implementation.md b/docs/roadmap/implementation.md
index a7d55da..9539af7 100644
--- a/docs/roadmap/implementation.md
+++ b/docs/roadmap/implementation.md
@@ -186,6 +186,10 @@ Validation: `go test ./internal/configuration ./internal/engine` and the affecte
 root API tests. Search for remaining interpreted-state consumers and confirm
 validation does not mutate the working configuration.
 
+Completion: validation, inventories, execution profiles, and prompt construction
+use the single resolved configuration. The configuration, engine, and root API
+tests pass; no interpreted-state consumers remain.
+
 ## Stage 5: Verify Provenance And Inspection Integration
 
 Scope: focused configuration tests and existing public inspection/diff tests.
diff --git a/internal/configuration/load.go b/internal/configuration/load.go
index 5a5eb67..149fb05 100644
--- a/internal/configuration/load.go
+++ b/internal/configuration/load.go
@@ -119,7 +119,6 @@ const (
 
 type loaded struct {
 	result          *configkit.Result[document]
-	interpreted     document
 	backends        map[string]map[string]fieldState
 	profiles        map[string]map[string]fieldState
 	promptMetadata  map[string][]promptInputPresence
@@ -250,8 +249,7 @@ func configurationDefinition(state *loaded) configkit.Definition[document] {
 			return nil
 		},
 		Validate: func(config *document, validation *configkit.Validation) {
-			state.interpreted = interpretConfiguration(config, validation)
-			validateEffective(&state.interpreted, validation)
+			validateEffective(config, validation)
 		},
 	}
 }
@@ -278,7 +276,7 @@ func load(main configkit.Input, underlays []configkit.Underlay) (*loaded, error)
 	if err := state.buildExecutionProfiles(); err != nil {
 		return nil, fmt.Errorf("load configuration: %w", err)
 	}
-	state.backendIDs = sortedKeys(indexedBackends(&state.interpreted))
+	state.backendIDs = sortedKeys(indexedBackends(&state.result.Config))
 	state.profileIDs = sortedKeys(state.indexedProfiles)
 	for _, id := range sortedKeys(state.prompts) {
 		state.promptIDs = append(state.promptIDs, domain.PromptIdentity{ID: id})
@@ -408,18 +406,6 @@ func sortedKeys[T any](entries map[string]T) []string {
 	return keys
 }
 
-func interpretConfiguration(config *document, validation *configkit.Validation) document {
-	interpreted := *config
-	if config.Collections != nil {
-		interpreted.Collections = make(map[string]collectionConfig, len(config.Collections))
-		for namespace, original := range config.Collections {
-			collection := original
-			interpreted.Collections[namespace] = collection
-		}
-	}
-	return interpreted
-}
-
 func validateEffective(config *document, validation *configkit.Validation) {
 	sets := resourceSets(config)
 	backendIDs := make(map[string]struct{})
diff --git a/internal/configuration/prompts.go b/internal/configuration/prompts.go
index 9b354e9..f709522 100644
--- a/internal/configuration/prompts.go
+++ b/internal/configuration/prompts.go
@@ -38,7 +38,7 @@ func (state *loaded) materializePrompts() error {
 		}
 		return metadata.Lookup(path)
 	}
-	for _, resources := range resourceSets(&state.interpreted) {
+	for _, resources := range resourceSets(&state.result.Config) {
 		for index, raw := range resources.prompts {
 			promptBase := resources.bases.prompts.Index(index)
 			if strings.TrimSpace(raw.ID) == "" {
diff --git a/internal/configuration/targets.go b/internal/configuration/targets.go
index 577fcde..e4691a4 100644
--- a/internal/configuration/targets.go
+++ b/internal/configuration/targets.go
@@ -12,8 +12,8 @@ import (
 )
 
 func (state *loaded) buildExecutionProfiles() error {
-	backendConfigs := indexedBackends(&state.interpreted)
-	profileConfigs := indexedProfiles(&state.interpreted)
+	backendConfigs := indexedBackends(&state.result.Config)
+	profileConfigs := indexedProfiles(&state.result.Config)
 	definitions := make(map[string]domain.Backend, len(backendConfigs))
 	for _, id := range sortedKeys(backendConfigs) {
 		config := backendConfigs[id]